null
null — 形容詞
1. not recognized or accepted by the law because it fails to meet legal requirement
無效的
法律上不具效力
not recognized or accepted by the law because it fails to meet legal requirements
The court declared the old contract null because it was signed under pressure.
法院宣告這份舊合約無效，因為它是在受壓迫的情況下簽署的。
passive: declared + noun + null
After the merger, several clauses in the agreement became null and void.
合併之後，協議中的幾項條款成了無效條款。
collocation: null and void
Judge Tomás ruled the fine null since the law had changed.
Tomás 法官裁定這筆罰款無效，因為該法律已修改。
Emma asked a lawyer whether her landlord's notice was null under local housing law.
Emma 詢問律師，房東的通知在當地住房法下是否無效。
- valid
having full legal force
文法句型
be + null
declare + noun + null
用法筆記
Often paired with 'void' in the fixed phrase 'null and void', a legal formula that reinforces the meaning. Subject is typically a document, agreement, ruling, or legal act.
常見錯誤
2. producing no useful result or having no real importance
無價值的
毫無用處或不重要
producing no useful result or having no real importance
Without proper funding, all our planning efforts are effectively null.
若沒有足夠的資金，我們所有的規劃努力實際上都是白費的。
adverb + null: effectively null
Élise felt that her years of training were null once she lost the championship.
Élise 覺得她多年的訓練在她輸掉冠軍賽之後全都白費了。
The promise turned out to be null when the company refused to honour it.
當該公司拒絕兌現承諾時，那項承諾就變得毫無價值。
Hassan realised that his apology was null if he kept repeating the same mistake.
Hassan 意識到，如果他一直重複同樣的錯誤，他的道歉就毫無價值。
- worthless
more common in everyday speech for things of no material or practical value
- meaningless
focuses on lack of purpose or significance rather than outcome
- futile
emphasises that an attempt produced no result despite effort
- valuable
having worth or importance
文法句型
be + null
用法筆記
Frequently used with verbs like 'prove', 'become', 'render', or 'turn out to be'. Common in figurative contexts where effort, promise, or value is negated.
常見錯誤
3. in mathematics or computing, containing no members or consisting entirely of zer
零的；空的
不含元素或全為零
in mathematics or computing, containing no members or consisting entirely of zeros
João noticed that the spreadsheet tracking the closed project was a null matrix, with every entry set to zero.
João 發現追蹤已結束專案的試算表是一個零矩陣，每一個欄位都是零。
attributive: null + noun (null matrix)
The database returned a null result when Takeshi searched for that product.
Takeshi 搜尋該產品時，資料庫傳回了空值。
Maeve's search for books by that author returned a null set — the library had none of his titles.
Maeve 搜尋那位作者的書時，圖書館沒有他的任何書籍，因此結果是空集合。
Obi learned that a null character marks the end of a string in C programming.
Obi 學到，在 C 語言中空字元標示字串的結尾。
- non-null
in computing, a value that exists and is not empty
文法句型
null + noun
be + null
用法筆記
Distinguish from sense 2 (worthless/meaningless): this sense is purely technical and describes the mathematical property of emptiness or zero. In computing, 'null' often refers to a pointer or value that points to nothing.
常見錯誤
null — 名詞
1. in computing, a special marker that indicates the absence of data rather than a
空值
表示沒有資料的特殊標記
in computing, a special marker that indicates the absence of data rather than a genuine zero or empty string
The programmer checked if the variable contained a null before running the calculation.
在執行計算之前，程式設計師檢查了該變數是否包含空值。
collocation: contain a null
Quinn's code crashed because the function returned a null instead of a number.
Quinn 的程式當掉了，因為函式傳回了空值而不是一個數值。
The system displays an error message when it receives a null from the database.
系統在從資料庫收到空值時會顯示錯誤訊息。
Emma's application kept crashing because it did not check for null before reading the file.
Emma 的應用程式一直當掉，因為它在讀取檔案之前沒有檢查空值。
- value
a meaningful piece of data
文法句型
return + null
be + null
check + for + null
用法筆記
In programming languages, null is not the same as zero. Zero is a numeric value; null means 'no value at all'. Subject is typically a variable, function, database, or system.
常見錯誤
null — 動詞
1. to make something lose its effect or force by doing something equally powerful w
抵消；使無效
用相反作用消除效果
to make something lose its effect or force by doing something equally powerful with the opposite outcome
The company's strong sales growth helped null the losses from the previous year.
該公司強勁的銷售成長幫助抵消了前一年的虧損。
null + object (effect)
Samir took on extra projects to null the budget cuts' effect on his team.
Samir 承接了額外專案，以抵消預算削減對其團隊的影響。
This buffer solution can null the acidity of the added chemicals.
這種緩衝溶液可以中和所添加化學物質的酸性。
The new policy did little to null the dissatisfaction among the night-shift workers.
這項新政策幾乎未能消除夜班員工的不滿。
- nullify
the more common verb form; preferred in most contexts
- cancel out
more informal; describes two opposing forces removing each other's effect
- negate
formal; emphasises logical opposition rather than practical counterbalance
- reinforce
to strengthen rather than remove an effect
文法句型
null + noun phrase
用法筆記
Much less common than the synonym 'nullify' in everyday English. This verb is found mainly in formal, technical, or computing contexts where a short verb is preferred.