🧩 词语组成解析
🗣️ 情景例句
What do you do, if I may ask?
你不介意的话，能告诉我你是做什么工作的吗？
Opportunity only knocks once.
机不可失，时不再来。
This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it.
因为如果有列火车开进隧道，它就把新鲜空气随之抽进了隧道。