Doubletree

[dʌbltri:]

解释:

(noun.) a crossbar on a wagon or carriage to which two whiffletrees are attached in order to harness two horses abreast.

斐迪南整理--From WordNet

解释:

(n.) The bar, or crosspiece, of a carriage, to which the singletrees are attached.

巴尔托迪编辑