Optional nature
[法] 任择性, 非强制性, 任意性
🧩 词语组成解析
🗣️ 情景例句
She's just like her grandma.
她就像她的祖母一样。
Three times a week I have to walk all the way to the gym for my Phys Ed class.
一周有三次，我为了参加体育课而必须走路到体育馆。
What's that? asked Lucy. She pointed at a strange thing with three legs and a strange top. It was made of metal.
“那是什么？”露西说。露西指着一个有三条腿和一个奇怪的顶部的怪怪的东西问。是用金属造的。