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1、Words and Expressions Unit 5various(adj)不同的，各种各样的不同的，各种各样的 I have tried various ways to improve English,but without success.Variety(n)不同种类，多样化不同种类，多样化 There is a large variety of after-class activities in our school.Vary(v)有差异，变化有差异，变化 The result of the experiment varied greatly from our prediction.
2、No wonder+(that)clause难怪难怪，不足为奇不足为奇今天午餐学校将提供免费批萨，难怪今天午餐学校将提供免费批萨，难怪学生们这么高兴。学生们这么高兴。The school will provide free pizza for lunch today.No wonder(that)the students are so happy.preserve(v)保存，保留保存，保留With the winter coming on,bears are beginning to preserve food.The United Nations will do everything to
3、preserve peace.To preserve forest,we should refuse to use throw-away chopsticks.(n)保护区保护区 nature preserve 自然保护区自然保护区preserved adj 保藏的，腌制的，可保存保藏的，腌制的，可保存的的preservation n 保存保存The old building is in good preservation.这栋旧建筑保存起来很好。这栋旧建筑保存起来很好。advance(v/n)前进，提前前进，提前The high living standard is due to rapid
4、 technological advance.The troops were given the order to advance.in advance（of sth）提前提前=ahead of timeAir ticket can be booked 3 days in advance.Galileos ideas were well in advance of the age in which he lived.You should tell me in advance.你应该事先告诉我。你应该事先告诉我。(adj)advanced 高级的，先进的高级的，先进的sbs advanced age 高龄，年事已高高龄，年事已高He is a man of advanced years.