昼间是一个时段，指的是从日出至日落之间的时段。
昼间的氨挥发损失随小麦生育期的推移迅速增大。
The ammonia volatilization rate in daytime rapidly went up along with the lapse of growing stage of wheat.
他们没有空闲时间，当美国的昼间轰炸开始后休假全部被取消了。
They could not be spared and when day bombing raids by the Americans began, leave was stopped altogether.
在1971年，沈阳为高空昼间侦察任务推出了第二种侦察改型J - 6。
In 1971, Shenyang introduced the second reconnaissance variant J-6 for high-altitude day reconnaissance mission.
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