Sennacrol
森纳克罗耳(番泻叶中的一个成分)
🗣️ 情景例句
She says
她也谈起
No man can be a good ruler unless he has first been ruled.
没受过他人的统治，就不能很好地统治他人。
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。