Living things evolve by accumulating genetic changes, which are then weeded out or preserved through a process of natural selection.

生物通过累积基因变异而实现进化，之后在自然选择过程中被淘汰或保留。

And they weeded out people who were listed as having anorexia or other conditions that alter body fat.

他们剔除了那些被列为厌食症或其他改变身体脂肪的疾病的人。

Gardeners often weeded out the grass to make room for the dandelions.

园丁们经常清除杂草，为蒲公英腾出空间。

Miraz weeded them out. Belisar and Uvilas were shot with arrows on a hunting party: by chance, it was pretended.

弥若兹把他们都除掉了。伯力沙和犹威拉思在一场狩猎中被箭射死了：而这被伪装成为意外。

A focus on costs has weeded out wasteful practices and improved operational efficiency.

对成本的关注消除了浪费行为并提高了运营效率。

On his arrival in England—or rather, in London—Champneis had weeded out his wardrobe.

Champneis 抵达英国（或者更确切地说， 抵达伦敦）后， 已经清理了他的衣橱。

The garden with its rows of corn, bright-yellow squash, butter beans and turnips was well weeded and neatly fenced with split-oak rails.

园子里束平地种着一行行的玉米，又黄又亮的南瓜、豆子、萝卜，没有丁点儿杂草，四周是橡树枝条做成的篱笆，显得整整齐齐。

Over time, populations evolve as traits that help them survive are typically selected, and traits that make it harder to survive are usually weeded out.

随着时间的推移，种群会不断进化，因为有助于其生存的特征通常会被选择，而使其更难生存的特征通常会被淘汰。

But if those mutations don't offer big advantages right away, they get weeded out, and body plans keep looking basically the same.

但如果这些突变不能立即提供很大的优势，它们就会被淘汰， 身体计划看起来基本相同。

Suellen never missed the opportunity to leave the plantation and give herself airs among people who did not know she weeded the garden and made beds.

苏伦从不放过离开农场到邻居们中去炫耀自己的机会，因为人们还不知道她近来常在家里拔草起床呢。