单词	echoing spontaneously
释义	echoing spontaneously 自发附和
随便看	sanitary pipe sanitary pipe laying sanitary pitting sanitary plane sanitary plumbing sanitary-plumbing equipment sanitary plumbing fixtures sanitary police sanitary pontic sanitary porcelain sanitary porcelain products sanitary pottery sanitary pottery fittings sanitary precaution sanitary quality sanitary quality control sanitary reconnaissance Sanitary reconnaissance of water source sanitary reform sanitary regulation sanitary regulations sanitary requirement sanitary requirement of illumination sanitary requirement of waste residue disposal sanitary risk factors