intrude:经常用于不要打扰别人或把意见强加给某人
invade:如：游客涌入城市，细菌侵入人体，隐私受到侵害，军队入侵
intrude:'打扰、侵入'
1.多指在无意或并不想的打扰 eg:I'm sorry to intrude, but i need to talk to someone.
2.扰乱某人/事，使其带来不好的影响。eg:the sound of the telephone intruded into his dream.
Invade：
1.多用于军事、战争上的侵略 eg:troops invaded the town
2.大范围的涌入导致损坏 eg:Demonstrators invaded the government building.
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