sin·gle·tree /ˈsɪŋgəl(ˌ)tri/
系曳繩的橫木
Sin·gle·tree n. The pivoted or swinging bar to which the traces of a harnessed horse are fixed; a whiffletree.
Note: ☞ When two horses draw abreast, a singletree is fixed at each end of another crosspiece, called the doubletree.
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