n.影响；冲击力；撞击
vt.挤入；压紧；撞击；对 ... 发生影响
vi.冲击；撞击；产生影响
Seasonality or economic cycles will have minimal impact on secular trends. 季节性或经济周期两者对长期趋势的影响都不大。
But what these people fail to see is that international tourism may bring about a disastrous impact on our environment and local history. 但是这些人忽视了国际旅游可能会给当地环境和历史造成的灾难性的影响。
The impact of the crash hurtled the driver against the windshield of the car. 碰撞的震力使驾驶员猛撞于车子的挡风玻璃上。
The impact of the stone against the windowpane shattered the glass. 石头撞击窗户打碎了玻璃。
用作及物动词 (vt.)A vast crowd impacted the square. 广场上挤集了一大群人。
There is a special tool to impact the road when it is under construction so the base is solid. 有种特殊的工具可以在道路修筑过程中将路面压紧，因此，路基是结实的。
Tight fitting clothes like jeans also impact fertility, he said. 他说,牛仔裤之类的紧身衣裤同样对生育力有影响。
用作不及物动词 (vi.)The company's performance was impacted by the high value of the pound. 公司的业绩受到了英镑高值的冲击。
The ball impacted against the bat with a loud noise. 球撞击着球棒发出很大的响声。
It is obvious how bad movies will impact on children. 坏电影对儿童会产生什么影响是显而易见的。
impact主要指“冲击，对主语碰撞的影响”，如the impact of science on/upon modern development（科技对于现代发展的影响）。注意句中science后的介词用on或upon；
impact作名词时，其所在的句子常用过去时。 The book made much impact.这本书的影响力很大。
