VOA慢速英语:New Law in US Aims to Increase Food Safety

exclude from把…排斥〔排除〕于…之外

例句：We can exclude the possibility of total loss from our calculations.
      我们可以在预测中把彻底失败的可能性排除在外。

      The university had no right to exclude the student from the examination.
      学校无权阻止这位学生参加考试。

2.Yet one thing has not changed.

yet用作连词时，与but一样也主要用于转折，意为“但是”“而”：

I have failed, yet I shall try again. 我失败了，但我还要尝试。

The judge was stern, yet completely fair. 法官很严峻，却完全公正。

They are the same, yet not the same. 它们又一样，又不一样。

It is strange, yet it is true. 那真是怪事，然而却是事实。

I’ve been away only for three years, yet I can hardly recognize my hometown. 我仅在外三年，可我几乎认不出我自己的故乡了。

He said he was our friend, yet he wouldn’t help us. 他说他是我们的朋友，但却不肯帮助我们。

3.About eighty percents of illnesses spread by food are still listed as having been caused by "unspecified agents."

still作副词使用时，含有“仍旧”、“还”之意，表示某事仍在继续，多用于肯定句或疑问句之中。例句：

     (1) My mother is still cooking. 我妈妈还在做饭。

     (2) Her arm still hurts. 她的胳膊还在痛。

     (3) In spite of his shortcomings, the girl still loved him. 尽管他有缺点，那个女孩仍然爱他。

     (4) Are you still working there? 你还在那里工作吗？

     (5) Will you still go there tomorrow? 明天你还会去那儿吗？