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
But I flunked all these classes.
但是所有的这些课都不及极。
Please ring off.
请挂电话。
Obviously, it has not been planned for the good of its inhabitants.
显然，现代化的城市不是为居民的利益而规划的。