Perfect obligation
[法] 合法的债务, 具有完备手续的债务
🧩 词语组成解析
🗣️ 情景例句
I'm with you.
我支持 。
He falls down the stairs.
他从楼梯摔了下来。
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。