Faculative
a. 允许的, 任意的, 兼性的, 偶发的
🗣️ 情景例句
My boyfriend just broke up with me.
我的男朋友和我分手了。
Jack grew timid when he saw the size of the shoes on the front step.
杰克看到了放在玄关的鞋子的尺寸时，甚为吃惊。
They went through the rooms, being careful to touch nothing, as they did not want to hinder the police in their search for fingerprints.
他俩搜遍这每一个房间，小心翼翼地不接触任何东西，因为他们怕妨碍警察寻找指纹。