There they undergo a selection process designed to weed out cells that might attack the body’s own cells (which display pieces of human proteins on their surface).
在胸腺里T细胞必须经过淘汰的过程，才能阻止有可能攻击自身组织(这些组织细胞表面表达的是自身蛋白)的T细胞发育成熟。
With such women on the prowl, even men who do have their own homes have come up with techniques to weed out the covetous and the inordinately materialistic.
面对如此徘徊的女性，即使那些有房子的男人也开始动起脑筋，避免碰上那些贪婪无厌极其拜金的女人。
This is necessary to weed out poor APIs: Too often, the implementers of an API never actually use their own interfaces, with disastrous consequences for usability.
这对于清除设计糟糕的API是必要的：我们常常看见API的实现者从来没有真正使用过他们自己的接口，这导致了可用性不高的灾难性结果。
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