这些机器将来会需要备件和维修保养。
We'll grow new livers, kidneys, hearts, and lungs like spare parts for a car.我们将长出新的肝脏、肾脏、心脏和肺,这些东西就像汽车的零部件一样。
The use of bicycles was constrained by their high cost and the lack of available spare parts.自行车因为价格高,而且缺乏可用的零件,其使用受到限制。