Bananas are sold by weight.

香蕉按重量出售。

《牛津词典》

All the other ingredients, including water, have to be listed in descending order by weight.

其它所有成分，包括水，必须根据其重量降序排列。

《柯林斯英汉双解大词典》

Cherries are sold by weight.

樱桃按重量销售。

youdao

Different explanations are offered for America's weight problem a problem increasingly shared by other countries.

VOA: special.2009.08.06

So, it's a trivial matter, by looking at what is the weight and how far does it drop, to say OK, how much work is done by the paddle wheel.

好，让我们看看重物的质量,以及它下落的距离，就知道桨轮做了多少功。

麻省理工公开课 - 热力学与动力学课程节选

Now it's not uncommon, by the way, for laboratory animals in these studies to triple their body weight.

顺便说下,在实验室,让动物体重变成普通的三倍,并不罕见

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Samoa Air says its program is the world's first fare structure that charges only by weight.

CNN: Pay-as-you-weigh airfares the 'next step'

Note that you are charged by weight, so think carefully before deciding to taste everything.

BBC: Island hopping in Finland

Britons police themselves by consensus much more effectively than they do by weight of enforcement alone.

BBC: NEWS | UK | New drink limit 'would cut toll'