Optional argument
[计] 任选变元
🧩 词语组成解析
🗣️ 情景例句
Well, we may read together aloud at home.
嗯 ，我们或许可以在家， 一起大声朗诵。
Pleasant hours fly fast.
欢乐的时间过得快。
As soon as he saw us, he picked up a long pipe which was covered with coins and opened one of the baskets.
他一见我们，就拿起了一个长长的上面镶有硬币的管乐器，并掀开了一个筐的盖子。