A system of pipes started to supply gas  and water to apartments and buildings.

管道系统开始向公寓和建筑物供应煤气和水。

Workers lowered these airtight wooden boxes into the river, where a system of pipes pumped pressurized air in and water out.

工人们将这些密封的木箱放入河中，管道系统将加压空气泵入并抽出水。