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treadle    
n. 踏木,踏板
vi. 踏动踏板,开动

踏木,踏板踏动踏板,开动

treadle
n 1: a lever that is operated with the foot [synonym: {pedal},
{treadle}, {foot pedal}, {foot lever}]
v 1: tread over; "the brick maker treadles over clay to pick out
the stones"
2: operate (machinery) by a treadle

Treadle \Trea"dle\, n. [OE. tredyl a step, AS. tredel. See
{Tread}.]
1. The part of a foot lathe, or other machine, which is
pressed or moved by the foot.
[1913 Webster]

2. (Biol.) The chalaza of a bird's egg; the tread.
[1913 Webster]


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