这种事情只有在外部条件有利时才会发生。Such events occur only when the external conditions are favorable.只有在外部E弦马克铅笔戳洞.Poke pencil holes only in the outer E string marks.动物生产在外部的毛称为保护毛.The outer hair of the animal is called gold ( guard ) h...
The progression of the disease can be retarded by early surgery.早期手术可以抑制病情的发展。The heavy rain retarded our progress.大雨妨碍了我们的进展。...a special school for mentally retarded children.为智障孩子设立的特殊学校He was so slow that many though...