Influence is the power to change or affect someone or something, the power to cause changes without directly forcing them to happen.
For instance, “He influenced the future of the company when he launched the new product.”
Influence更多表达的是用无形的权力、能量影响人或物。产生影响的过程不需要直接的推动，更多的是由于无形的影响力。比如，公司新产品的上市影响了公司的未来发展。
Affect is usually a verb, and it means to impact or change.
For example, "A new discovery can affect a scientific theory." "The weather affected the outcome of the football match."
Affect是动词，指的是去影响或改变人或物。比如天气的好坏会影响足球队比赛的结构。天气会影响人的情绪。
Effect is a noun, and it means the result of a change. The effect of the change can be big or small, positive or negative.
For instance, “If an event affects your life, you will feel the event’s effect.”
“The rain had an effect on the condition of the grass.”
Effect通常作为名词来使用，表达的是一种变化的结果，是客观的陈述。这个结果可大可小，可以是积极的，也可以是消极的。比如，雨水对生长的花花草草是有影响的。
Impact primarily means something that comes about as the result of something coming forcibly into contact with something else. It has a much more disruptive and negative connotation.
For instance, "The budget cuts will have an impact on music and arts in the schools."
Impact主要是指人或物产生了改变，但这个改变是其他人或物的强制性的、被迫的结果。因此这个词通常隐含着被干扰不舒服、不希望改变的意思。比如，预算的缩减影响了学校在音乐以及艺术上的投入。
英语单词Influence, Affect, Effect, Impact的区别
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