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

生物积基因变异而实现进化，之后在自然选择程中被淘汰或保留。

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。伯力沙和犹威拉思在场狩猎中被箭射死：而这被伪装成为意外。

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

对成本的关注消除浪费行为并提高运营效率。

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.

园子里束平地着行行的玉米，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，群会不断进化，因为有助于其生存的特征常会被选择，而使其更难生存的特征常会被淘汰。

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。

I had sweet-peas planted on the fence one year and often worked and weeded among them as he watched me a few feet away.

有年我在篱笆甜豌豆， 当他在几英尺外看着我时， 我经常在它们中间工作和除草。

I've struggled for food and for money and I've weeded and hoed and picked cotton and I've even plowed until I can't stand it another minute.

我曾经为吃的用的拼命挣扎，我拼命拔草，锄地，摘棉花，甚至扶犁耙，直到连分钟也坚持不下去为止。

Connections that are used are kept and strengthened, while under-used ones are weeded away, creating a brain that is both fine-tuned to its environment and energy efficient.

正在使用的脑连接被保留下来并增强，不太使用的脑连接会被除掉，发育成个完美适配环境又合理消耗能量的大脑。

In these notes, Mr Studwell wanders into the weeds of development (quite literally: Japanese rice is weeded nine times a year, he writes).But he never gets lost.

在这些脚注中，Studwell 偶尔会提到些阻碍经济发展的“杂草”（从字面意义来说，他写到日本的水稻年需要进行九次除草）。但Studwell 从未偏离主题。

Now there were only the well-bound little-read English Classics, which were weeded out of her father's library to fill up the small book-shelves in the drawing-room.

现在只有装订精良、鲜为人知的英国经典名著， 它们是从她父亲的图书馆里淘汰出来的， 塞满客厅里的小书架。

So a bad gene that tends to kill relatively young adults is also likely to indirectly kill their young kids, and thus be weeded from the gene pool, too.

因此，个倾向于杀死相对年轻的成年人的坏基因也可能间接杀死他们年幼的孩子，从而也被从基因库中剔除。

In the process, the government has weeded out tens of thousands of ghost employees, since the embezzlers who invented them could not open accounts in their names without a matching ID.

在这个程中，政府清除成千万的内鬼，因为盗用公款的人，名不符实，无法开帐户。

She went from place to place, and dug and weeded, and enjoyed herself so immensely that she was led on from bed to bed and into the grass under the trees.

她从个地方走到另个地方，挖地除草，玩得很开心，以至于她从张床走到另张床，直拖到树下的草地。

While he dug or weeded he whistled or sang bits of Yorkshire moor songs or talked to Soot or Captain or the brothers and sisters he had taught to help him.

当他挖地或除草时， 他会吹口哨或唱几首约克郡荒野歌曲， 或与烟灰或船长或他教的帮助他的兄弟姐妹交谈。

She searched about until she found a rather sharp piece of wood and knelt down and dug and weeded out the weeds and grass until she made nice little clear places around them.

她四处寻找，直到找到块相当锋利的木头，然后跪下来挖出杂草和杂草，直到她在它们周围开辟出漂亮的小空地。