clackv.发出咔嗒声;使咔嗒咔嗒地响n.咔嗒声
clack-valven.瓣阀
clack butterfly蝶形瓣
Clackmannanshire克拉克曼南郡[英国苏格兰原郡名]
Clack tip opening displacement裂纹尖端张开位移