by/with the skin of one's teeth 不是某人牙齿的牙皮

Bert passed the spoken language exam by the skin of his teeth。 【误译】伯特轻而易举地通过了口语考试。 【正确】伯特差一点就没通过口语考试。 说明： by (with) the skin of one's teeth 是源自典故的口语(介词短语)， 意为"差一点不","险些没有","好不容易才","侥幸"。