et
et — 縮寫
1. A short written form of 'ethyl', the chemical group C₂H₅−, used in molecular for
乙基縮寫
有機化學中 ethyl 的簡寫
A short written form of 'ethyl', the chemical group C₂H₅−, used in molecular formulas and lab reports in organic chemistry.
The lab report showed an ET group attached to the benzene ring.
實驗報告顯示苯環上接了一個 ET 基團。
ET group — ethyl functional group in organic molecules
Esteban noted that the ET substituent increased the compound's volatility.
Esteban 指出 ET 取代基提高了該化合物的揮發性。
In organic chemistry textbooks, ET is a standard abbreviation for the ethyl group.
在有機化學課本中，ET 是乙基的標準縮寫。
Yara drew the molecule with the ET group clearly labelled on the diagram.
Yara 在圖表上畫出該分子，並清楚標示了 ET 基團。
文法句型
ET + noun (e.g., ET group, ET substituent)
用法筆記
Primarily appears in written chemical contexts — molecular diagrams, lab notebooks, and research papers. Not used in spoken chemistry lectures.
2. A written abbreviation for Eastern Time, the time zone covering the US East Coas
美東時間
美國東部時間 (EST/EDT) 縮寫
A written abbreviation for Eastern Time, the time zone covering the US East Coast (UTC−5 standard / UTC−4 daylight), widely used in TV schedules, meeting announcements, and sports broadcasts.
The webinar starts at 2:00 PM ET; West Coast viewers log in at 11:00 AM PT.
網路研討會於美東時間下午 2：00 開始；西岸觀眾在上午 11：00 PT 登入。
time + ET — standard format for US time zone reference
Quinn set an 8:30 AM ET alarm for the New York earnings call.
Quinn 設了美東時間早上 8：30 的鬧鐘，以便收聽來自紐約的即時財報電話會議。
The football game is scheduled for 7:00 PM ET on Saturday.
這場美式足球賽排定在週六美東時間晚上 7：00 開打。
Tamar checked the ET conversion before booking her flight from London.
Tamar 在預定從倫敦出發的班機之前，先確認了美東時間的轉換。
文法句型
[time] + ET
用法筆記
ET covers both EST (winter) and EDT (summer). When publishing an event time, use ET rather than EST or EDT unless daylight-saving status needs to be explicit. Also used in international contexts for US East Coast coordination.
et — 名詞
1. A short, informal way of saying 'extraterrestrial' — a being from outer space. T
外星生物
extraterrestrial 的簡稱
A short, informal way of saying 'extraterrestrial' — a being from outer space. The term became widely recognized through Steven Spielberg's 1982 film E.T. the Extra-Terrestrial, where the title character is a gentle alien stranded on Earth.
In the film, the children helped the gentle ET return to its home planet.
電影裡的孩子們幫助溫和的 ET 回到自己的母星。
the ET — referring to a specific extraterrestrial character
Sahil dressed up as an ET for the Halloween party, complete with a glowing finger.
Sahil 在萬聖節派對上扮成 ET，還做了會發光的手指道具。
Scientists search for signs of ET in radio signals from distant galaxies.
科學家透過來自遙遠星系的無線電訊號，尋找外星生物的蹤跡。
Hui wondered whether any ET had ever visited our solar system.
Hui 好奇是否有任何外星生物曾經造訪過我們的太陽系。
- alien
The most common neutral term for any extraterrestrial being, without the warm cultural associations of ET.
- extraterrestrial
The full formal term; more scientific and less emotional in tone.
- space being
An informal, descriptive phrase usable in children's media and casual conversation.
文法句型
the ET
an ET
ET + verb
用法筆記
When referring to the film character, many writers capitalize and punctuate it as E.T. When referring to the general concept of extraterrestrial life (e.g., in SETI discussions), lowercase et or all-caps ET are both used. The form with periods (E.T.) is more common in film reviews and nostalgia contexts.