Limescale
n. 水垢; 垢石
🗣️ 情景例句
I'll be the leader.
我来当指挥。
How much is it by air mail?
航空信要多少钱？
becomes so worn and unreliable that it eventually is not worth mending.
磨损太厉害，老得一点儿也不准了，最终会不值得修理了。