Tetrinic acid
[化] 特春酸; α-甲基特窗酸
🧩 词语组成解析
🗣️ 情景例句
The advanced class is nonstop.
高级课程， 是没有休息的。
Is it too late?
来得及吗？
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。