重点讲解：
1. suffer from
（因疾病或处于其他不利境地而）受苦，受难，受折磨；
eg. Many people suffer from a great dread of heights.
许多人非常畏高。
eg. Those who suffer from narcissism become self-absorbed or chronic show-offs.
被自恋症折磨的人会变得只专注于自己的事情，或者不断地自我炫耀。
2. prevent sb. from doing sth.
阻止；制止；阻碍；
eg. They did not prevent him from expressing his views.
他们没有阻止他发表自己的观点。
eg. A runner exercises before a race to prevent his muscles from tensing up.
赛跑运动员在比赛前要活动活动，以放松肌肉。
3. take the lead
引导；带头；做榜样；
eg. He took the lead in breaking down superstitions.
他带头破除迷信。
eg. t may be up to businesses to take the lead.
也许企业界应在其中发挥领导作用。
