teeth是tooth的复数形式。牙齿是以个体存在的，所以是可数名词， 例句I need to have two teeth filled. 我有两颗牙要补。 The dentist may decide that the...
one of后面加最高级。 例句 We rate him as one of the best. 我们认为他是最优秀者之一。 One of her parents is blind. 她的父母有一个是盲人。 It\'s b...
