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liu ming is my chemistry' teacher. he is an ordinary-looking little man with thick glasses, but he has a strange way of making his classes lively and interesting.
　　i remembered his first lesson. he put three bottles on the desk. one was filled with kerosene, one with castor oil, and one with vinegar. and he said "now watch carefully. pay attention to everything that i do." he held up one of his fingers and dipped it into the cup after he mixed the three kinds of liquid in a big cup together. a few seconds later, he took his finger out, put it in his mouth and sucked it. "how delicious! you must do everything that i do." said he. and then we did it like him. lmmediately we made a face. the mixture tasted horrible.
　　it was first chemistry lesson. i never forget it.
　　译文：
　　刘明是我的化学老师，他是一位相貌平常、个子矮小的人，戴着一副深度眼镜。但他有一种奇妙的方法使他的课上得生动有趣。
　　我记得他上的第一堂课，他把三个瓶子放在桌子上，一个装满煤油，一个装满蓖麻油，一个装满醋。他说：“现在你们仔细地看，注意我做的每一件事情。”他把三种液体混合在一个大杯子里之后，就把一个指头浸在装有混合物的杯子里。几秒钟以后，他把指头拿出来放到嘴里去吮吸。然后说：“味道多么好呀!你们必须照我做的一模一样地去做。”接着我们都按照他做的去做。我们立即做出鬼脸，这种混合物太难吃了。
　　我永远忘不了我的第一节化学课。