Arbitraging
v. 套汇, 套利（arbitrage的现在分词形式）
🗣️ 情景例句
Two is enough.
两块足够了。
Sorry, She is out. Shall I take a message?
抱歉，她外出了，你要留口信吗？
At night, when you really wish to go to sleep, you rarely manage to do so.
到了夜晚，你真想睡了，却很难入睡。