E.m.f.
[医] 电动势, 红细胞成熟因子
🗣️ 情景例句
He was very kind.
对人和蔼。
It's faster but more expensive to ship goods by air.
空运较快但运费较高。
He always meant to go back on day, but not to stay.
他总想将来回国看看，但却不愿长期住下去，