Copula
n. 系词, 介体, 接合部\\n[医] 介体; (舌)联桁; 交配
✅ 同义词
📖 牛津释义
copula
n
(grammar) type of verb that connects a subject with its complement 系词（即连系动词, 用以连结主语及其补语）
In `George became ill', the verb `became' is a copula. 在Georgebecameill一句中, became是系词.
🗣️ 情景例句
I consider him my best friend.
我将他视为我最好的朋友。
A close mouth catches no flies.
病从口入，祸从口出。
The sad truth is that most of us have been brought up to eat certain foods and we stick to them all our lives.
不无遗憾的是， 我们中的大部分人，生来就只吃某几种食品，而且一辈子都这样。