An atmosphere composed of a cold gas mix that is lighter than helium and not much heavier than hydrogen, means that hot-air ballooning will need to be used.

一个由寒冷气体混合比氦要轻但是不会比氢重很多的大气层，意味着热气球将需要使用。

youdao

By making the thick glass bottles invented by Dom Perignon lighter, champagne makers will save some 8,000 metric tons of greenhouse gas pollution per year with future vintages.

唐培里侬轻型酒发明了通过制造厚玻璃瓶，在未来的葡萄酒上，香槟生产商将会每年减少8 000吨的温室气体污染。

youdao

By making the thick glass bottles invented by Dom Perignon lighter, champagne makers will save some 8, 000 metric tons of greenhouse gas pollution per year with future vintages.

唐培里侬轻型酒发明了通过制造厚玻璃瓶，在未来的葡萄酒上，香槟生产商将会每年减少8,000吨的温室气体污染。

youdao

So transporting gloopy oil is far more profitable than shifting lighter-than-air gas.

ECONOMIST: Energy Transfer bids for Sunoco

Royal Dutch Shell also reported declines in their fourth quarter profits, and blamed lighter European demand, lower natural gas production (Exxon) along with a high demand for equipment and skilled workers and the difficulties involved in tapping reserves in politically unstable regions (Shell).

FORBES: BP Loses Steam

Fuel cells also recharge quickly on a boost of gas, much the same way a cigarette lighter gets refilled.

FORBES: Ollila: Nokia Drops Fuel Cell Research