people should be prevented to fell trees.
how tall are you ?1.70meters
our classroom is 40meters in length,30meters in width and 50 meters in height.People must be orevented from and cut down the trees.
How tall are you?1.70.
we is 40m long classroom 30m wide,is 50m high.① It must be to prevent felling of trees.
② you go from here? 1.70
③ our classrooms and 40 m long and 30 meters wide, 50 meters in height.