Optional argument
[计] 任选变元
🧩 词语组成解析
🗣️ 情景例句
Your first great-grandchild.
你的第一个曾孙。
I'm very well, and you?
我很好，你呢？
When a plane from London arrived at Sydney airport, workers began to unload a number of wooden boxes which contained clothing.
当一架来自伦敦的飞机抵达悉尼机场时，工人们开始卸下装有服装的一批木箱。