class 是什么意思？grade是什么意思？

class 是班级，grade是年级。

class班级grade 年纪

还是看看这两词的英文释义吧，也许有助于我们分辨，再作“等级”讲时，两个词的英文释义分别如下：
class:
(a)set of people, animals or things grouped together,esp according to quality
(b)one orf several different levels of comfort, etc available to travellers in a train, plane, bus etc
(c)one of several grades of achievement in a university degree examination

grade:
(a)step,stage or degree of rank, quality,etc; level of classification
(b)mark given in an ecamination or for school work
(c)level of (esp musical) skill at which a pupil is tested.

class