Formal bond
[化] 形式键(在式中理论上可写出而实际上太远的键)
🧩 词语组成解析
formal
['fɔ:məl]
adj. （学校教育或培训）正规的;方式上的;礼仪上的;
n. <美>须穿礼服的社交集会;<口>夜礼服;
🗣️ 情景例句
It was not until yesterday that I noticed it.
我一直到昨天才注意到它。
He was born with a silver spoon in his mouth.
他生在富贵人家。
He has to deduce what he can from the few scanty clues available.
他们必须根据现有的不充分的线索进行推理。