Sulfalepsine
氯二氧苯基吡咯烷基苯磺酰胺
🗣️ 情景例句
How many people are there in your family?
你家里有几口人？
It's not four o'clock.
还没到四点呢。
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。