Beryllia
氧化铍
🗣️ 情景例句
These are lucky kids.
这是一群幸运的孩子。
A group of us went out to the theater last night.
我们一群人昨晚去外面到剧院。
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。