It may be a good idea to have some spares just in case.

这可能是一个好主意，有一些备件，以防万一。

youdao

It can be difficult to get spares for some older makes of car.

有些旧型号汽车可能不好买配件。

《牛津词典》

Captain: Mr. Agent, we need some ship board spares. Can you buy them for us?

船长：代理先生，我们船上需要一些备件，您能帮我们买一下吗？

youdao

Captain: Mr. Agent, we need some ship board spares. Can you buy them for us?

船长：代理先生，我们船上需要一些备件，您能帮我们买一下吗？

youdao