prematures早产儿prematureadj.提前的；过早的；早产的n.早产儿；早熟Premature quadruplets早产四胎premature ejaculation早泄,射精过早premature coagulation早期凝固premature convergence早熟收敛premature climacteric更年期提前Premature quintuplets早产五胎premature atrial beat房性过早搏动premature bit failure钻头过早磨损Premature lung injury早产儿肺损伤premature vaporization效前挥发