drift和是漂移的意思，而trend则是趋势的意思，区别可以从以下例子看出：
Can you see that chart, showing the trend of this stock, even it drift slowly, but I still can see it is move up. 你能看到那张图表，显示了这只股票的走势，即使它缓慢漂移，但我仍然可以看到它在向上移动。