Easy installation, equipment and lighter.

安装简便，设备轻巧。

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Hydrogen is lighter than air, but compressing it, storing it in tanks and adding all the necessary equipment starts to tip the scales towards heavy again.

氢气比空气轻，但是将它经压缩存储在燃料箱中并添加所有必需设备后飞机又变重了。

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What contractors need to understand, he said, is that there are transportation, labor and equipment savings from using lighter components, and potential maintenance savings, too.

他说承包商需要了解的是：用轻质材料能节省运输、劳动力和设备费用，以及潜在的维护费。

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For example: The new Cayman has a 2.4-inch longer wheelbase than before, shorter overhangs, larger wheels, a larger greenhouse (the base of the windshield has been pulled forward and the hatch-line lands farther back), and a higher equipment level, and yet this visually muscled-up Cayman still manages to be about 60 pounds lighter than the car it replaces, thanks to aluminum-intensive structures and assembly shared with the 911 Carrera.

WSJ: 2014 Porsche Cayman S Review: 911's Little Brother Grows Up | Rumble Seat by Dan Neil

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