评论
打印
1.A new report from the BBC states that illegal teeth-whitening beauticians are putting their customers at risk of serious health problems.
at risk of冒...风险
He saved three children alive at risk of his life.
他拼命救出了三个孩子。
2.The teeth-whitening industry in the UK is regulated and the practice can only be performed by professionals.
perform 执行
Several grafts may be performed at one operation.
在一次手术中可能会进行多次植皮。
