机组人员关错发动机后就坠毁了。
The crash occurred when the crew shut down the wrong engine.
有一天，他煮完粥后忘了关火。
One day, he forgot to turn off the fire after cooking porridge.
现在请同学们再阅读文章，这次，读完文章后，你要试着去读过三关。
Now please read the passage again. This time, you should pass three levels after reading.
水煮沸后，关火，去掉表面的泡沫。
When the water boils, turn the heat down and remove the foam on top.
关火后加入意粉拌匀，加入洋芫荽即可享用。
Turn off the heat add linguine and toss well garnish with parsley. Serve.
炒好后关火用盘子装起来就可以了。
他常常在午夜后才关电视。
他常常在午夜后才关电视。
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