Nbcs
[医][=newborn calf serum]新生牛血清
🗣️ 情景例句
And again--thanks.
再次谢谢你。
I'm confident you've made the right choice.
我确信你做了正确的选择。
Many of the stars cannot be seen because they are too far away.
许多星星我们之所以看不见，是因为它们离我们太远。