Tìm kiếm
Sprag
01
a chock or bar wedged under a wheel or between the spokes to prevent a vehicle from rolling down an incline
02
a wooden prop used to support the roof of a mine
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Tìm kiếm
a chock or bar wedged under a wheel or between the spokes to prevent a vehicle from rolling down an incline
a wooden prop used to support the roof of a mine