lewis

lewis — 名詞

1. a chemical substance that can take a lone electron pair offered by another subst

1.名詞C2
釋義

路易斯酸

能接受一對電子的化學物質

a chemical substance that can take a lone electron pair offered by another substance (a Lewis base) and use that pair to create a new covalent bond. Unlike traditional acids, a Lewis acid does not need to release hydrogen ions.

例句

Boron trifluoride acts as a Lewis acid when it accepts electrons from ammonia.

三氟化硼在接受氨的電子對時，扮演路易斯酸的角色。

collocation: act as a Lewis acid

The chemistry teacher explained that a Lewis acid must have an empty orbital to receive electrons.

化學老師解釋說，路易斯酸必須有一個空軌域才能接收電子。

grammar pattern: Lewis acid + must + infinitive

同義詞
反義詞
  • Lewis base

    the substance that donates the electron pair in the reaction

用法筆記

Almost always capitalised because it is named after the chemist Gilbert N. Lewis. Frequently appears in the paired phrase 'Lewis acid and Lewis base'. The key structural feature is an empty orbital that can accept an electron pair.

常見錯誤

❌A Lewis acid gives away protons.
✅A Lewis acid accepts electron pairs.
💡the definition is about electron-pair acceptance, not proton donation (that is a Brønsted acid).
❌The Lewis acid in the battery leaked.
✅The acidic electrolyte in the battery leaked.
💡'Lewis acid' is a theoretical classification, not a common household substance.

2. a set of three iron wedges that fit together inside a specially cut dovetail-sha

2.名詞C2
釋義

起重楔

吊掛大型石塊的楔形鐵具

a set of three iron wedges that fit together inside a specially cut dovetail-shaped hole in a large block of stone. When a crane chain is attached to the top ring of the device, the wedges grip the stone tightly so it can be lifted safely.

例句

The stonemason cut a dovetail hole in the granite block to receive the lewis.

石匠在花崗岩塊上鑿出一個燕尾槽，以安裝起重楔。

collocation: cut/receive a lewis

Workers inserted the three iron wedges of the lewis into the stone before hooking up the crane.

工人先將起重楔的三塊鐵楔插入石塊，再鉤上起重機。

collocation: insert the wedges of the lewis

同義詞

用法筆記

A highly specialised term found almost exclusively in stonemasonry, heritage building restoration, and quarrying contexts. Also called a 'lewis bolt' or 'lewis pin' in some regional dialects. The device is named after the person who popularised its design, though the exact origin is debated.

常見錯誤

❌He tied a rope around the lewis.
✅He attached the crane hook to the ring of the lewis.
💡a lewis has a ring or eye at the top; you do not tie a rope around it.
❌The lewis is a type of hammer.
✅The lewis is a lifting device, not a striking tool.
💡a common confusion because both are used in stonemasonry.

lewis — 名詞

1. the surname of several notable people in literature, science, exploration, and p

1.名詞
釋義

路易斯

多位著名人物的姓氏

the surname of several notable people in literature, science, exploration, and public life. Listed below are seven prominent figures who share this name.

例句

C.S. Lewis wrote The Chronicles of Narnia, a series beloved by children around the world.

C.S. Lewis 創作了《納尼亞傳奇》系列，深受全球兒童喜愛。

C.S. Lewis — British author

Meriwether Lewis led the famous Lewis and Clark Expedition across the American West in 1804.

Meriwether Lewis 於 1804 年率領著名的路易斯與克拉克遠征隊橫跨美國西部。

Meriwether Lewis — American explorer