class的意思,class是什么意思

html里class是什么意思
welcome to the unit unit 4 my day it's time for class.
unit 2 i'm in class one, grade three. lesson 9 课件 (共44张.
is there _____ zhang min in your class? 请问下图量到底的答案!
七下unit_4c_don't_eat_in_class_section_b 2ppt