Backbone chain
[化] 主链
🧩 词语组成解析
chain
[tʃen]
n. 链子，链条;连锁，连续;拘束;连锁店或旅馆系列的事物;
vt. 用铁链锁住;监禁，束缚;
🗣️ 情景例句
I've been having a hard time keeping my eyes open
我一直挣扎着要让双眼睁开
Packing charges are excluded in the quoted prices.
包装费用未算在报价中。
I went there three days ago.
我三天前去过那儿。