1.split from 脱离,从...分离
例句:The more mutations in the gene, the faster that species has evolved since it split from the common ancestor.
从共同的祖先那里分离之后,这种基因中的变异越多,说明这个物种的进化就越快 。
2.tie the knot 结婚
例句:My other suggestion is that you be engaged for six months or more before you actually tie the knot.
我的另一个建议就是在你决定结婚前,你起码得订婚六个月,甚至更多 。