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Trammel
01
限制
a restraint that confines or restricts freedom (especially something used to tie down or restrain a prisoner)
02
约束具
a restraint that is used to teach a horse to amble
03
三角钩
an adjustable pothook set in a fireplace
04
三层网
a fishing net with three layers; the outer two are coarse mesh and the loose inner layer is fine mesh