Doubletree
[dʌbltri:]
解釋/意思:
(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
解釋/意思:
(n.) The bar, or crosspiece, of a carriage, to which the singletrees are attached.
巴尔托迪編輯