make an effort与make some effort的区别是什么?

make an effort
努力
例句
To make an effort; strive.
努力；力争
Make an effort to arrive promptly.
尽力早些赶到
make unnecessary an expenditure or effort.
省去不必要的花费或努力.
To make an individual contribution toward an overall effort.
尽责,尽本分朝向整体目标而做出个人的贡献
Fail to work or to make an effort
失效；不能使用；不再努力
To make every effort.
竭尽全力
To make a joint effort.
共同努力
To make an effort; strive.
努力；力争
make a strenuous or labored effort.
作出艰巨、谨慎的努力.
Make an effort to arrive promptly.
尽力早些赶到
make some effort 只是一种用法
不是固定的
make an effort是固定用法
应该是make some effort更大