root and branch
A:I wish you wouldn't be so selfish.
A:我希望你别太自私。B:Selfishness is one of human being's instincts. It is very difficult to get it out root and branch.
B：自私是人类的本性之一，想连根拔除是很难的。
A:But you should at least consider your son's future.
A;但是你起码得替你儿子的未来想想。B:His mother, not me, should do this.
B：是她妈妈应该这么做，不是我。