it needs batteries » 它需要电池 Everyone in my class has a backpack » 在我的班级的每个人都有一个背包 ..
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不过，这台设备需要汽车电池为它供电。
如果太阳能产业可以崛起——并且世界需要它如此——光电池将不得不成为发电产业中造价低廉的一份完整的份额。
If solar power is ever going to take off-and the world needs it to-photovoltaic cells will have to become a whole lot cheaper to produce.
这一系统将滴灌的高效性与太阳能水泵结合起来，它既不需要电池与汽油，也不需要煤油。
Linking the efficiency of drip irrigation to the reliability of a solar-powered water pump, the PVDI systems need no batteries, gas, or kerosene.
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