Faculative
a. 允许的, 任意的, 兼性的, 偶发的
🗣️ 情景例句
Don't forget to write.
别忘了给我写信。
Absolutely right.
绝对正确。
She always referred to them as 'the shifting population', for they came and went with such frequency that I never even got a chance to learn their names.
她称这些佣人叫“流动人口”，因为他们来匆匆，所以我甚至都没有机会知道他们的姓名。