英语make life difficult

英语make life difficult
life为什么不加s?life作生活时不是可数名词吗?
1.生命;生存[U]
How did life begin?
生命是如何起源的?
2.活的东西[U]
There is no life on the moon.
月球上没有生物。
3.(个人的)性命[C]
He risked his life to save the child.
他冒生命危险救那孩子。
4.一生;寿命[C]
His life was full of misfortunes.
他的一生充满了不幸。
5.(物的)寿命,有效期[C]
The machine's life is very long.
这机器使用寿命很长。
6.人生;世上[U]
Life isn't all fun.
人生不都是充满欢笑。
7.生活(状态);生计[C][U]
I know that he has a very hard life.
我知道他日子过得很艰难。
He did not know her way of life.
他不知道她的生活方式。
8.传记[C]
I'm reading the life of Dickens.
我在读狄更斯的传记。
9.元气,活力[U]
He is full of life.
他充满了活力。
10.支柱,灵魂[the S][(+of)]
She was the life of the party.
她是宴会上最活跃的人。
11.无期徒刑[U]
The criminal was sentenced to life.
罪犯被判处无期徒刑。
12.实物,真货[U]
This was painted from life.
这是根据实物画的。