Backup power could also be provided by linking wind farms with a solar cell, with conventional or pumped-storage hydropower, or with efficient natural-gas-burning turbines.
将风力发电厂与太阳能电池、常规或抽水蓄能的水电或高效的天然气涡轮机连接起来，也可以提供备用电力。
2
In the United States, the vast majority of carbon monoxide released into the atmosphere comes from vehicles and other gas-burning equipment, but fires also contribute.
在美国，释放进入大气层的主要一氧化碳的来源于车辆与燃气设备，火也是致使因素之一。
3
If you smell something unusual (gas fumes or burning, for instance), take the car to your mechanic.