ratchets的中文意思、音标与词形变化

n. （防倒转的）棘齿( ratchet的名词复数 ) v. （防倒转的）棘齿( ratchet的第三人称单数 )

n mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction v move by degrees in one direction only