When we are working or running, we need more air.
我们干活或者奔跑时，需要较多的空气。
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。
Please keep the windows open. We need more fresh air.
请让窗户开着，我们需要更多的新鲜空气。
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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