A gravity knife is a knife with a blade contained in its handle, and which opens its blade by the force of inertia or gravity. As the gravity knife requires gravity or spinning motion to propel the blade out of the handle, it differs fundamentally from the switchblade, which opens its spring-propelled blade automatically upon the push of a button, switch, or fulcrum lever.
例句与用法
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Travellers are liable to prosecution if they bring intoout of hong kong any " weapon " which includes chinese - style throwing dart , gravity knife , gravity - operated steel baton , knuckleduster , chinese - style fighting iron , spring - loaded steel baton , any knife the blade of which is exposed by a spring or other mechanicalelectric device , and any bladedpointed weapon 旅客如把“武器”包括中国式飞镖、重力刀、重力操作钢棒、指节套、附有手柄的铁链、弹簧钢棒、任何以弹簧或其他机械电动装置露出刀刃的刀，以及任何有刀刃尖端的武器带进带离香港，可遭检控。
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