迎刃而解

"Once the principal contradiction is grasped, all problems will be readily solved."

"一旦抓住了主要矛盾,一切问迎刃而解。"

Most of our social problems would be solved if we could somehow get rid of the immoral, crooked, and feebleminded people.

如果除去那些不道德、和意志薄弱人，们多数社问迎刃而解。