impact作为影响、作用的意思时，是可数名词，复数为impacts。作为撞击、碰撞、撞击力的意思时，是不可数名词。例如：have an impact on，对……有影响。I have to question the impact of these functions.公平合理，我不得不怀疑这些功能的影响。

impact：英[ˈɪmpækt,ɪmˈpækt]；美[ˈɪmpækt,ɪmˈpækt]

n.影响；撞击；强大作用；冲撞；冲击力

v.冲击；撞击；(对某事物)有影响

第三人称单数：impacts

复数：impacts

现在分词：impacting

过去式：impacted

过去分词：impacted

impact test.冲击测试；[力]冲击试验；冲辉验；撞击测试

impact factor.影响因子；影响指数；影响因素

impact crater.撞击坑；陨石坑；冲击坑；冲击构造

1、The report assesses the impact of AIDS on the gay community.

这个报告评估了艾滋病对同性恋群体的影响。

2、The real impact will be felt in the developing world.

发展中国家将会受到真正的影响。

3、The research is too unfocused to have any significant impact.

这一次的研究太零散，难以发挥重大的作用。

4、Her father's death impacted greatly on her childhood years.

父亲去世对她的童年造成巨大影响。

5、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。

6、Businesses are beginning to feel the full impact of the recession.

工商企业开始感受到了经济衰退的全面冲击。

7、The building makes a tremendous visual impact.

这栋建筑物给人以极其深刻的视觉印象。

8、The car is fitted with side impact bars.

这辆车的两侧都安装了保险杠。

9、The impact of the blow knocked Jack off balance.

这一记猛击把杰克打了个趔趄。

10、Airbags protect the driver in the event of a severe frontal impact.

汽车若遇到正面猛烈撞击，安全气囊可以保护驾车者。

11、Airbags are designed to soften the impact of a car crash.

气囊用来减轻汽车碰撞的冲击力。

12、The impact ruptured both fuel tanks.

冲撞使两个燃料箱都爆裂了。

13、The bomb explodes on impact.

炸弹受到撞击就爆炸。

14、This financial crisis had a much greater impact on Main Street.

这次金融危机对老百姓的影响更为深远。

15、Society begins to have an impact on the developing child.

社会开始对成长中的孩子产生影响。

16、Such schemes mean little unless they impact on people.

这些计划没什么意义，除非它们对人民产生影响。

17、The major impact of this epidemic worldwide is yet to come

这种传染病在世界范围内的重大影响还未完全显现。

18、It will take a few more years to judge the impact of these ideas

要再花上几年的时间才能判断出这些想法的影响。

19、It was difficult to measure the precise impact of the labor action.

此次罢工影响几何，难以作出准确的评估。

20、The two wings of the aircraft broke off on impact

飞机的两个机翼遭受撞击折断了。