Faculative
a. 允许的, 任意的, 兼性的, 偶发的
🗣️ 情景例句
What you say makes no sense.
你说的话毫无道理。
Sometimes the snow was so deep we could tunnel through it.
偶尔雪会积到可以造隧道那般的深度。
Good afternoon, class! Who's on duty today?
同学们，下午好！今天谁值日？