Alternations
(alternation 的复数) n. 交互, 轮流, 间隔\\n[计] 交替工作
🗣️ 情景例句
Right.
对。
He might have been held up in a traffic jam.
他可能因交通阻塞而耽搁了。
It is much cheaper to post or email a long report than to fax it.
邮寄或电子邮递一封长篇报告比传真要便宜得多。