Polina
n. (Polina)人名；(罗)波利娜
🗣️ 情景例句
Don't mention it.
别在意。
Have him return my call.
让他给我回电话。
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，