影响influence可数吗

His first music teacher was a major influence in his life.

他的第一位音乐老师是他一生中对他影响非常大的人。

Her parents no longer have any real influence over her.

她的父母对她不再有任何真正的影响力了。

Many external influences can affect your state of mind.

许多外在因素都可能影响人的`心情。

A number of social factors influence life expectancy.

诸多社会因素左右着人的预期寿命。

Those friends are a bad influence on her.

那些朋友对她有负面的影响。