on an hour与in an hour的区别

on an hour与in an hour的区别
on an hour与in an hour的区别

on an hour与in an hour的区别
In Britain they put the clock on an hour in spring.
在英国,人们在春季便把时钟拨快一小时.
I will be with you again in an hour at the furthest.
我最迟一小时后就回来.
in an hour （1）是一小时以后的意思,用于将来时.（2）是一小时内的意思