Pittop
[采矿]上车场
🗣️ 情景例句
I have just begun to learn and my serve isn't very good.
我刚刚开始学习，发球不太好。
Not bad.
不赖嘛！
Ethanol is more effective at a concentration of 50-70 percent;
乙醇的浓度为50％至70％时比较有效，