The weight-average method was applied to make the original image to the grayscale image.

在图像灰度化的阶段是采用了加权平均值的方法。

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The water insoluble precipitate (acetic acid lignin, AcL) had a low weight-average molecular weight range from 341 to 253 (Mw) and a narrow molecular weight distribution from 1.1 to 1.2.

水不溶沉淀物（乙酰化木质素）的重均分子量分布在341到253之间，分散性系数分布在1.1到1.2这一窄范围内。

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The developed countries are responsible for 44% of waste, and in the U.S. alone, the average person throws away their body weight in rubbish every month.

发达国家要对44%的垃圾负责，而且单是在美国，平均每个人每个月会扔掉相当于他们身体的量的垃圾。

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Mothers of Indian, Pakistani and Bangladeshi origin had a high risk of having low birth-weight babies - their babies are on average 300g lighter than those of white mothers.

BBC: NEWS | Health | More tiny babies being born in UK

It is feared any potential benefits from the extra boost of 80bhp for up to six seconds each lap will initially be negated by the system's weight (on average 35kg) and its knock-on effect on balance, weight distribution and reliability, not to mention the cost and anxiety over its safety.

BBC: F1 teams face testing times

Both the high-dose and the low-dose colonies grew more slowly than the undosed ones, gaining 8-12% less weight on average.

ECONOMIST: Bees and insecticides