Protonsphere
质子层
🗣️ 情景例句
When is check-out time?
什么时候必须结帐和离开宾馆？
The milkman hopes the cows have plenty of milk every morning.
挤牛奶的人希望每天清晨都能得到大量牛奶。
Once the existence of this wave-length had been discovered,
一旦这种波长的实际存在被发现，