例句與造句

1. He also planned a system of docks for the city of Montreal.
2. It consisted of a system of docks and warehouses and a pump and engine room.
3. June organized a force of 100 men and built complete machine shops, a pumping station, and a system of docks.
4. It's difficult to find system of docks in a sentence. 用system of docks造句挺難的