1. discover vt.发现; 碰见
例句：The fact is that he did not discover it.
事实是他没有发现它。

2. scavenge vt.清除污物，打扫
例句：You can often scavenge nice bit of old furniture from skip.
从废物堆里往往能捡到一些挺好的旧家具。

3. variety n.多样; 种类; 杂耍
例句：This variety of controls contributed to a broadening use of the toolbar.
这种控件变体扩展了工具栏的用途。

4. scientific adj.科学的; 有系统的
例句：People began verify their scientific hypotheses by stringent tests.
人们开始用精确的试验证实自己的科学假说。
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