influence影響可數嗎

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）

What are the influences of TV ads on us?

電視廣告對我們的影響是什麼？（可數）

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。