VOA慢速英语:Scientists Look at Plant Products With an Eye to New Possibilities for Health

例句：The outer door needs repairing.
      外面的门需要修理一下。

2.sharpen v.(使)变得更好(或技术更高、更有效等)；提高某人(或事物)的水平(或技术、效率等)

例句：She needs to sharpen up before next month’s competition.
      下个月比赛之前，她的水平需要提高一下。

      This exercise will help students sharpen up their reading skills.
      这个练习将帮助学生提高阅读能力。

3.compound n.复合物, 化合物, 混合物

例句：When two or more elements combine and form a compound, a chemical change takes place.
      当两种或两种以上的元素结合形成化合物时, 发生化学变化。

4.inflammation n.<医>发炎；炎症

例句：Many babies develop a mild inflammation in the eyes a few days after birth.
      许多婴儿出生几天后眼睛有轻度炎症。

5.marinate vt.把…浸泡于腌泡汁中