As we age, our skin becomes paler.随着年龄的增长，我们的皮肤愈见苍白。For the first two or three days lochia is bloodstained and then becomes paler in color.在头2-3天,恶露深有血液,以后颜色变白.In the gaslight she looked paler than ever.在煤气灯光下她显得比以往任何时候都...
尿液是无菌的。Urine is sterile.这个盖子严实地盖在奶瓶上,保持奶嘴无菌.This top fits over the bottle and keeps the teat sterile.手术室应该是个无菌的环境.An operating theatre should be a sterile environment....
The police nicked me for carrying an offensive weapon.警察以携带攻击性武器为由逮捕了我。Keep quiet or we'll all get nicked.别出声，要不然我们都会被抓住的。I nicked my chin while shaving.我刮胡子时割破了下巴....