重点讲解：
1. refrain from sth./doing sth. 克制；忍住；
All sides must refrain from any violence, intimidation or provocative actions.
各方都必须避免任何暴力、恐吓或挑衅行为。
2. ahead of 领先于；比…出色；
She was always well ahead of the rest of the class.
她总是遥遥领先班上的同学。
3. in contact with 接触；
Have the children been in contact with the disease?
孩子们同这种疾病有过接触吗？
4. attribute to 把…归因于；把…归咎于；
Don't attribute all your mistakes to objective causes.
不要把你的错误都归咎于客观原因。