So, models with a BMI of 18 or less weigh too little when compared to how tall they are.

体重指数等于或低于18的模特体重与身高的比例过低。

The runners do not want to bring too much. They want the backpack to weigh as little as possible.

参赛者不想带太多东西。他们希望背包尽可能轻一些。

However bacteria weigh so little and water is so viscous that they basically have no inertia – there is no gliding on this scale.

但是，细菌的重量是如此轻，水是如此黏稠，它们在运动时基本上没有惯性，在这个尺度里没有滑翔运动的存在。

This nest may hold up to eighty hatchlings that right now are around ten centimeters long and weigh little more than a golf ball.

这个巢穴里可能有多达八十只幼龟，它们现在大约有十厘米长，比高尔夫球重一点。

The equipment weighs little, can be installed on almost any flat surface and is cheap to buy: roughly €100 to €150 per square metre.

该设备重量轻，几乎可以安装在任何平坦的表面上，而且购买价格便宜：每平方米大约 100 至 150 欧元。