Postcosta
亚前缘脉
🗣️ 情景例句
When's the last time you took a vacation?
上次你去度假是什么时候？
I will come back with him if he asks me.
我会和他走回来，假如他要求我的话。
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。