Aeropalynology
大气孢粉学
🗣️ 情景例句
I'll be right back.
我马上就回来。
I woke up seven and got up right away.
我七点醒了，然后马上起床了。
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。