慢速英语:Severe Ocean Storms: The Science of Nature's Power

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例句：As you may recall, he was in the army then.
      你可能记得当时他正在从军。

      The scene recalled her childhood.
      这一情景使她想起了童年。

2.observance n.遵守,奉行;庆祝

例句：pedantic observance of the rules
      墨守成规

      The speaker advocated a less austere observance of the Sabbath.
      演讲者倡导放宽安息日的严格规定。

3.rate v.定级
 
例句：Her performance didn't rate high in the competition.
      她的表演在这次比赛中等级不算高。

      They rated the new film.
      他们给那部新片定了级。

4.continuous adj.连续的, 没有中断的

例句：The brain needs a continuous supply of blood.
      大脑需要不断供给血液。

5.commonly adv.通常地,一般地

例句：It is not a theory that is commonly subscribed to.
      一般人并不赞成这个理论。

      Leagues are commonly made for joint defence.
      结成联盟往往是为了共同防御。

6.combine vt.使结合,使联合;兼有,兼备;使化合

例句：They combined their efforts.
      他们同心协力。

      It would be more profitable to combine the two factories.
      把这两家工厂联合起来更能赚钱。

7.category n.种类, 类别

例句：These form an independent category.
      这些形成了一个独立的种类。