supernumerary

基本解释

To our knowledge, this is the first report of supernumerary breast tissue on the foot.
据我们所知，这是第一个被报道在脚底长出副乳组织的案例。
Guterstam and his colleagues then tested the extent to which subjects had adopted this supernumerary limb.
Guterstam说他的同事们接着测试了被试者适应他额外上肢的程度。
The dairy-work lasted only till the milk began to lessen, for she had not met with a second regular engagement as at Talbothays, but had done duty as a supernumerary only.
奶牛场里的杂工到奶量减少的时候就不需要了，因为她没有找到和在泰波塞斯奶牛场一样的第二份正式工作，所以她只能做一个编外的临时工。

But introducing this supernumerary charge has probably added little to America's case.
ECONOMIST: The weakest part of the case for war