15 minutes earlier 和 15minutes early 区别

15 minutes earlier 是比15分钟更早的意思，而15minutes early 则是早15分钟的意思，区别可以从以下例子看出：

You can come for interview 15 minutes early, but don't come 15 minutes earlier, which show you not good in time manege. 你可以提前15分钟来面试，但不要比提前15分钟更早，这说明你不懂得时间管理。