The influence of climate on crops are self-evident.

　　氣候對農作物的影響是不證自明的。（不可數(shù)）

　　What are the influences of TV ads on us?

　　電視廣告對我們的影響是什么？（可數(shù)）

　　News media have a  great influence on people's mind.

　　新聞媒介對人的思想有很大的影響。

　　I don't want to influence you. You must decide for yourself.

　　我不想影響你。你必須自行決定。