Erh
abbr. 平衡相对湿度（equilibrium relative humidity）
🗣️ 情景例句
It's seventy-five cents for adults and thirty cents for children under twelve.
大人75美分，12岁以下的小孩30分。
I'm two years younger than my sister.
我比我姐小两岁。
So I drove back to the town and began to retrace the route, taking frequent glances at the map.
于是我驾车返回小镇，重新按路线行驶。