a range of,a variety of区别

a range of:
在...范围
例句与用法:
A range of endeavor or activity; a province.
范围努力做…的范围或活动范围；范围
A range of hills rose on their left.
连绵的小山耸立在他们的左侧.
It's an electric drill with a range of different attachments.
这是一个带有各种配件的电钻.
The gun has a range of five miles.
这炮的射程为五英里.
1.种种
All of them arrived late for a variety of reasons.
由于种种原因,他们都来晚了.