A flat roof has poor drainage.
平的屋顶排水差。
Our backyard is flooded by heavy rain because the drainage is poor.
因为排水系统很差，我们的后院被大雨淹了。
Our backyard is flooded by heavy rain because the drainage is poor.
因为排炎系统很差，我们的后院被大雨淹了。
Our backyard is flooded by heavy rain because the drainage is poor.
因为排炎系统很差，我们的后院被大雨淹了。
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