VOA慢速英语:New Alliance to Study Greenhouse Gases in Agriculture

例句：The emission of visible light by a hot object.
      白热光物体遇热发出可见光。

      Dangerous emissions radiate from plutonium.
      钚幅射出有害射线。

2.launch v.使下水,发射,发动,发出

例句：We'll have to work against the clock if we want to launch the website on time.
      如果要按时建成这个网站，我们不得不和时间赛跑。

3.digestive a.消化的,有消化力的

例句：This oil is very good for regulating digestive disorders.
      这种油对消化不良很有疗效。

4.combine vi.结合,联合,化合

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

      The two small shops combined to make a large one.
      这两个小店合并起来成为一个大商店。