And so what we do is we buy these drills that have a potential capacity of thousands of hours of drill time, use them once or twice to put a hole in the wall and let them sit.
因此我们做的就是买下这些 实际上有着数千小时使用寿命的钻头 然后用它们在墙上钻一两次洞，就把它们闲置在一边