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问题: 请解决以下问题

Energy allows us to heat homes ,and power factories,and transportation.这里“heat”是什么意思?
We currently use it for around one-third of
world electricity generation.请翻译一下这个句子。
Natural gas is the cleanest fossil fuel by
weight .为什么这里用“by weight”?
One way for the UK and others to reduce
greenhouse gas could be increased nuclear
power generation.为什么用“increased”而不用
“ increasing”?

解答:

1. heat 是暖气
2. 在现在的电器时代,全球有1/3的国家都在用它.
3.按重量的
4.could be 被动式 动词+ed gas被increased,不作主动.