单词	collapse and crack
释义	collapse and crack 塌陷开裂
随便看	background irradiated background irradiation background Iuminescence background job background job processor background jot background knowledge background knowl-edge background knowledge of culture background knowledge of English culture background layer Background learning background lectromagnetism field background level background levels background light background lighting background light sensor background light source background-limieed infrared photography background limited detector background limited infrared detectivity background limited infrared detector background-limited infrared detector Background Limited Infrared Photoconductor