如果你必须错过一堂课，事前提醒我以防你不会因此而在课堂参与的部分失掉分数。
If you must miss a class, warn me so that you do not lose credit for class participation.
如果必须的话你责怪科技吧，但并不能改变这个事实，那就是你正在错过许多奇妙的收获。
Blame your answer on technology if you must, but that doesn't change the fact that you're missing out on a lot of wonderful benefits!
在这，如果你错过了公交车，你就必须等待两个小时才会有下一辆。 这太让人郁闷了！
Here, if you miss the bus, you have to wait another two hours.
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