求翻译：延安地区年降水量只有500mm，且多集中在夏季，因此雨水收集是有效的节水措施。收集来的雨水可以用于夏季绿化浇灌和冲厕。是什么意思？

Yan'an area annual rainfall of only 500mm, and more concentrated in the summer, so rainwater harvesting is an effective water conservation measures. Collected rainwater can be used in summer green watering and flushing.

In Yan'an in annual precipitation is 500 mm, and focus more in the summer, so rain water collection is effective water conservation measures. To collect the rainwater can be used for summer green water and flushing toilets.

The Yan'an area year precipitation only then 500mm, also concentrates in the summer, therefore the rain water collection is the effective saving water measure.Collects the rain water may use in the summer afforesting the irrigation and flushing the restroom.

Annual precipitation in Yanan area only 500mm, and is concentrated in the summer, so rainwater harvesting is an effective water-saving measures. Summer green water and can collect rainwater to be used for flushing.

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