每天给花木灌水的时间。冬季在气温上升后，温室在10时后，露地在中午；夏季在气温较低时，如早晨或傍晚。
灌溉窗口效率是在每个晚上周期中实际管理灌溉时间相对于在理想状态下的管理灌溉时间。
The WWE shows how a system is actually managing water during its nightly irrigation cycle compared to how it would manage water in an ideal situation.
尼罗河在一年的大部分时间里平静而祥和，过去每年都会泛滥，从而创造，灌溉并把新的表土运到附近的农田，古埃及赖以生存。
Calm and peaceful for most of the year, the Nile used to flood annually, thereby creating, irrigating and carrying new topsoil to the nearby farmland, on which ancient Egypt depended for livelihood.
尼罗河虽然在一年的大部分时间里平静而祥和，但是过去每年都会泛滥，从而生成、灌溉并把新的表层土搬运到附近的古埃及人赖以为生的农田。
Calm and peaceful for most of the year, the Nile used to flood annually, thereby creating, irrigating and carrying new topsoil to the nearby farmland on which ancient Egypt depended for livelihood.
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