牙斑如果不清除就会导致牙齿蛀蚀和牙龈疾病。When not removed, plaque causes tooth decay and gum disease.戒指内侧有一层厚厚的锈斑。The tarnish lay thick on the inside of the ring.她比较胖，脸色暗淡、多斑。She was rather fat, and her complexion was muddy and spotty....
Set up the mosquito net before you make the bed.铺床前先把蚊帐挂起来.The robot orderly, for example, can deliver meals and prescriptions; It'still can't make the bed.以机器人勤杂工为例, 它能够送饭和药方, 但是还不会铺床.They have to make the bed...
Some food labelling practices really get my back up.有些食物标签的贴法实在让我生气。He booted the ball 40 yards back up field.他一脚踢出40码远，把球踢回前场。Alternative treatments can provide a useful back-up to conventional treatment.替代疗法能为传统的治疗提供有效...