directions用什么介词
directions用介词in,indirections中文意思是“向四面八方”Theshockwaveformsaconeofpressurizedairmoleculeswhichmoveoutwardandrearwardinalldirectionsandextendtotheground.冲击波形成了一个由压缩气体分子构成的...
directions用介词in,indirections中文意思是“向四面八方”Theshockwaveformsaconeofpressurizedairmoleculeswhichmoveoutwardandrearwardinalldirectionsandextendtotheground.冲击波形成了一个由压缩气体分子构成的...