1. vt.预防　 stop sth happening
2. vt. & vi.阻止　 stop sb from doing sth

　～ a destructive explosion　防止破坏性爆炸
　～ a disaster　预防一场灾难
　～ a smile　克制住笑
　～ a war　阻止一场战争
　～ damage　防止损害
　～ its freezing　防止它冻结
　～ the airplane's taking off　使飞机无法起飞
　～ the spread of pneumonia　预防肺炎蔓延
　～ admirably　很好地预防
　～ automatically　自动防止
　～ cautiously　小心地预防
　～ completely　完全阻止
　～ effectively　有效地预防
　～ effectually　有效地预防
　～ forcibly　强有力地防止
　～ fully　完全阻止
　～ mechanically　机械性地防止
　～ medically　医疗防止
　～ permanently　永久防止
　～ probably　可能防止
　～ scientifically　科学地预防
　～ unavoidably　不可避免地阻止
　～ from　阻止…发生
　～ sb from coming　阻止某人前来
　～ disease from spreading　防止这种疾病蔓延

　We shall come tomorrow if nothing prevents.　如没有什么阻碍的话，我们明天来。
　Business has prevented me.　我因有事耽搁了。
　Sally said she would come to see me if nothing prevented her.　萨丽说要是没有什么事情妨碍她的话，她就来看我。
　These rules are intended to prevent accidents.　制定这些规则，是为了防止事故。
　Systems, however good, cannot prevent evils.　制度再好也防止不了坏事发生。
　They are taking effort to prevent a new civil war.　他们正努力制止一场新内战。
　A severe cold prevented his attending the meeting.　他患了重感冒，未能出席会议。
　Nobody can prevent our getting married.　谁也阻止不了我们结婚。
　That affair will probably prevent me coming.　那件事可能使我来不了。
　The rain prevented us starting on a trip.　下雨阻碍了我们出发去旅游。
　That didn't prevent us getting on very well together.　这并不妨碍我们很好地相处。
　What can we do to prevent this disease spreading?　我们能做什么来阻止这种疾病蔓延呢?
　He would be the man to prevent a new war breaking out.　此人也许能阻止新的战争爆发。

 ♣ prevent from　(v.+prep.)
　阻止，防止　stop from; keep from
　My only idea was to prevent the woman from speaking.　我唯一的想法就是不让那女人讲话。
　I am very sorry that a previous engagement prevents me from accepting your kind invitation.　很抱歉，因为我已另有约会不能接受你好意的邀请。
　Let nothing prevent you from doing your duty.　不要让任何事情妨碍你尽你的职责。
　This will prevent them from abusing their power and enjoying special privileges.　这就可以防止他们滥用权力，享受特权。
　We should take measures to prevent the flood from threatening that area.　我们应该采取措施防止洪水威胁那地区。
　Metals are usually coated with paint to prevent them from rusting.　通常在金属上涂漆以防止生锈。
　What prevents rays from entering your eyes?　什么阻止光线进入你的眼睛?
　His prompt action prevented the fire from spreading.　他的果断行动制止了火势的蔓延。
　Who prevents their plans from being carried out?　谁会阻止他们实施自己的计划呢?
　We must try to prevent our environment from being polluted.　我们应该防止环境受到污染。
　I have been unavoidably prevented from coming.　我身不由己，不能前来。
　I was prevented by illness from joining in the competition.　我因病未能参加竞赛。
　Unless we get more funding we'll be prevented from finishing our experimental programme.　我们如果得不到更多的经费，将无法完成实验计划。
　They were prevented from stealing the car by a smart policeman.　一名机警的警察使他们盗车未遂。

 ♣ prevent, block
　这二者都可表示“阻止”，其区别是：prevent表示某种障碍阻止某人做某事， block指有效地堵住了所有的通道，使人、物等无法通过。例如：
　Bad weather prevented us from starting.　恶劣的天气使我们不能动身。
　Heavy snow blocked our road.　大雪堵住了我们的去路。
 ♣ prevent, hinder
　参见hinder条。
 ♣ prevent, preclude
　参见preclude条。

1. 她企图阻止他去，但他还是去了。
　［误］ She prevented him from going, but he still went.
　［正］ She tried to prevent him from going, but he still went.
　［析］ prevent表示“阻止”成功，如果阻止未成功则应该说try to prevent.
2. 谁也不能阻止这个计划的实现。
　［误］ No one can prevent the plan from carrying out.
　［正］ No one can prevent the plan from being carried out.
　［析］ 在prevent...from...结构中，若介词from后的宾语有被动意义，则要用动名词的被动形式。
3. 没有什么能阻止他独立作环球航行。
　［误］ Nothing could prevent him to sail round the world single-handed.
　［正］ Nothing could prevent him from sailing round the world single-handed.
　［正］ Nothing could prevent him sailing round the world single-handed.
　［正］ Nothing could prevent his sailing round the world single-handed.
　［析］ 表示“阻止某人做某事”，可以说prevent sb from v-ing, prevent sb v-ing或prevent sb's v-ing，但不能说prevent sb to-v sth.

　［同义词］ avoid, bar, block, inhibit, restrain, stop
　［反义词］ cause, foster, help
　［词源］　拉丁语praevenier（先来到）