Swapped
v. 交换（工作）( swap的过去式和过去分词 ); 用…替换, 把…换成, 掉换（过来）
🗣️ 情景例句
She suffered terribly when her son was killed.
儿子被杀，她痛苦至极。
In college I majored in physics, What was you major?
大学时我主修物理，你主修什么呢？
Once waves have been generated,
一旦波浪形成，