单词	清关
释义	清关qīngguāncustoms clearance
随便看	essential amino acids essential amino acid，eaa， indispensable amino acid essential and non-essential essential and nonessential, essential and non-essential points essential area essential asthma essential attribute essential bargaining problem essential boundary condition essential bradycardia essential bus essential calculus essential cause essential--cause essential cause-- efficient cause essential cause; efficient cause essential character essential--color essential colour essential completeness essential complexity essential component essential compound essential constituent