Subformula
[计] 子公式
🗣️ 情景例句
It's OK, lady. Take your time.
没关系， 太太。慢慢来。
What time does the first train to Boston leave?
第一班去波士顿的列车什么时间开出呢？
because balloons can be a great danger to aircraft.
因为气球有可能给飞机造成极大的危险。