词汇	nested block
释义	nested block 嵌套分程序
随便看	underwater stroke mechanic underwater structure under-water structure project underwater structures underwater submarine warfare program Underwater Submarine Warfare Research underwater/subsea operation technique underwater surveillance underwater survey underwater survillance underwater swimming underwater swimming set underwater synchronization underwater synchronously scanned system Underwater Systems Group underwater tank underwater tanker underwater tapping machine underwater target underwater target activated sensor underwater target depth measure underwater target detection underwater target detection system underwater target dimension recognition underwater target echo detection