When we are working or running, we need more air, so we breathe faster than usual.
我们劳动或跑动的时候呼吸比平时快，也就需要更多空气。
In the hot summer when there ia a power outage we feel all the more the need for electric energy which powers the electric fan md air-conditioner.
在炎热的夏天，当断电时，我们更感需要能驱动电风扇和空调器的电能。
In the hot summer when there ia a power outage we feel all the more the need for electric energy which powers the electric fan md air-conditioner.
在炎热的夏天，当断电时，我们更感需要能驱动电风扇和空调器的电能。
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