Stf
[医][=serum thymus factor]血清胸腺因子
🗣️ 情景例句
I realize that pPeter wants you to marry him this summer.
我知道彼德想要你今年夏天和他结婚。
It's hard to say.
很难说。
I like spring and summer.The days are long and the night are short.The sun rises early and sets late.
我最喜欢春季和夏季。因为此时白天长而夜晚短，太阳升得早而落得迟。