Guardwire
保护导线
🗣️ 情景例句
No, I'm sorry. This is our rock-bottom price.
很抱歉，这是我们的最低价格。
You'll get hurt, if you don't watch out.
你不注意的话，就会受伤。
Imagine a pen attached to the weight in such a way that its point rests upon a piece of paper on the floor.
假定把一支笔拴在重物上，笔尖落在地板上的一张纸上，