swin·gle·tree /ˈswɪŋgəl(ˌ)tri/
馬車前端的橫木
Swin·gle·tree n. A whiffletree, or whippletree. See Singletree.
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swingletree
n : a crossbar that is attached to the traces of a draft horse
and to the vehicle or implement that the horse is pulling
[syn: whiffletree, whippletree]