I reckoned it was a) 280 kg.

我猜测是a) 280千克。

A tonne of rice produces around 200kg of husks and those, in turn, yield 40kg of silica.

一吨水稻可以产生约200公斤的稻壳，这些稻壳又可以产生40公斤的硅土。

The production of a single cotton tote emits an estimated 272 kg of carbon dioxide.

每生产一只棉质手提包大约会排放 272 公斤的二氧化碳。

Because inside, there are 100kg of plutonium.

因为石棺内有100公斤的钸。

I've lost 7 kg in the last two months.

这两个月我已经减掉了7公斤。

Typical weight loss after a year is barely over 5 kg.

一般一年减重不超过5公斤。

In that time, we've collected and saved 1.3kg of dust.

在这期间，我们收集并保存了 1.3 公斤的灰尘。

Was it a) 280 kg, b) 480 kg, or c) 680 kg?

是 A. 280千克，B.480千克，还是 C. 680千克？

She had no jaw weighed only 1.3 kg and couldn't eat or drink.

她没有下巴，体重只有1.3公斤，不能吃也不能喝。

It costs about $10,000 to transport 0.45kg of materials from Earth to the Moon.

把0.45公斤的材料从地球运到月球大约需要1万美元。

Okay, so he said that it might take me two months to lose ten kgs.

他说可能需要两个月才能减掉10公斤。

This means if you weigh 70kg you would require 14,000mg of caffeine to overdose.

也就是说，如果你的体重是70公斤，那14000毫克的咖啡因就算过量。

After two months diligently following the program, Yao lost about 14 kg.

经过两个月的努力，他减掉了14公斤。

But to make 1kg of crickets?

那生产1kg蟋蟀呢？

Modern plastics are so strong that a 60 gram jug can carry 4 kg of milk.

现代塑料非常牢固，一个 60 克的塑料罐可以装 4 公斤牛奶。

The authors found that at 56 days old the three birds had average weights of 0.9kg, 1.8kg and 4.2kg.

研究人员发现，在56天大的时候，这三只鸟的平均体重分别为0.9公斤、1.8公斤和4.2公斤。

If you have only got 4kg of overweight baggage, it can be checked free of charge.

如果您只超重了4公斤，能免费托运。

It takes 15,000 liters (3,962 gallons) of water to produce just 1 kg (2.2 lbs) of beef.

仅生产一公斤牛肉就需要 1.5 万升水。

It weighs in at 3080 kg.

它的重量为 3080 公斤。

Omar measures 120 cm - that's over two thirds of my height - and weighs a heavy 14 kg.

Omar身长120厘米，都超过我身高的三分之二了。它重达14公斤。