trend和tendency均含“趋势,倾向”之意.
trend指：事物发展总的方向、倾向或趋势,它指的是整个社会或者比较大群体的一种趋势或者潮流,例如：
The current trend is towards informal clothing.
目前的趋势是穿着比较随便.
tendency指：固有或习得的倾向性,强调没有外来的影响或干扰,
一般指的是人有某种倾向性或者某种趋势,例如：
He had a tendency to shrink up whenever attention was focused on him.
当别人注意他时,他就会退缩一旁.