Faculative
a. 允许的, 任意的, 兼性的, 偶发的
🗣️ 情景例句
Sorry to trouble you, do you have these shirts in any other colors?
麻烦你了，你们有其他颜色的这种衬衫吗？
No one is a fool always, every one sometimes.
无人总是当傻瓜，人人有时当傻瓜。
But so far, the public has expressed its gratitude to the students in letters to the Press.
但到目前为止，公众已经向新闻界写信表达他们对学生们的感激之情了。