Dendrohydrology
年轮水文学
🗣️ 情景例句
Your new exercise class?
你的新健身班
Friends are lost by calling often and calling seldom.
交往过密过疏，都会失去朋友。
If explosives are used, vibrations will cause the roof of the mine to collapse.
如果用炸药爆破，震动会引起矿顶塌落。