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무효화하다
무효화하다基本解释:名词虚假说,零假说及物动词使抵消; 使无效
지금까지
지금까지基本解释:adv.以前;迄今为止
에어컨
에어컨基本解释:air-conditioning名词空调设备,空调系统动词给…装上空调,用空调调节(空气)( air-condition的现在分词 )
적절한
적절한基本解释:形容词恰当的,适当的; 有…倾向的; 易于…的; 聪明的,灵巧的abbr.(=automatically programmed tool)自动数控程序; (=automatic picture transmission)(人造卫星)自动图像传输; (=advanced passenger train)先进型旅客特快列车; (=automative professional training)汽车专业训练apt
소풍
소풍基本解释:名词(尤指集体)远足; 短途旅行,游览; 离题; [机]冲程