n a sharp abrupt noise as if two objects hit together; may be repeated
n a simple valve with a hinge on one side; allows fluid to flow in only one direction
v make a rattling sound
v make a clucking sounds, characteristic of hens
v speak (about unimportant matters) rapidly and incessantly
n. 噼啪声( clack的名词复数 )
v. 噼啪响( clack的第三人称单数 )