环保灯对地球来说是好的，而且它很省钱、方便，因为它不需要每隔几个月就更换一次。
The eco-light is good for earth, and it's cost-effective and convenient, because it doesn't have to be changed every few months.
这种冰箱十分环保，因为它耗电更少。
The fridge is environmentally friendly because it uses less electricity.
航空旅行不是一种环保的旅行方式，因为它耗费大量的能源。
Air travel is not an environmentally-friendly way to travel because it uses a lot of energy.
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