Tetranitrocompound
四硝基化合物
🗣️ 情景例句
I like it here.
我喜欢这里 。
Mr. Green, Mr. Smith is here.
格林先生，史密斯先生在这里。
Yes, and we must stop people walking on this floor until it's firm. It may be necessary to put up a notice saying Keep off. Another thing, we' ll have to drill a hole in the wall for the electric wires.
是的，因此在地板牢固前，我们必须防止人们从地板上行走。可能还需要竖一个布告牌，写上“不得践踏”。还有，我们必须在墙上钻一个电线孔。