spare /sper/ adj. 多余的，闲置的:

例句/词组:

A decline in beer sales had left the industry with spare capacity (=the ability to produce more than can be sold) .
啤酒销售量的下降使该行业出现产能闲置。

英语解释：

not being used or not needed at the present time
多余的，闲置的:

助记技巧：

spare /sper/ adj. 多余的，闲置的:

来自古英语sparian，表示：匀出来。

spare 引申为：多余的，闲置的: