synthetic trough

例句：

1. 1. The engineer designed a synthetic trough to drain the excess water from the garden.
   工程师设计了一个合成沟渠来排干花园里的积水。
2. 2. The construction of this synthetic trough will significantly reduce the amount of wastewater discharged into the river.
   这个合成沟渠的建设将显著减少流入河流的废水量。
3. 3. The farmers used a synthetic trough to collect rainwater for irrigation purposes.
   农民们使用一个合成沟渠来收集雨水用于灌溉。