如图所示A、B两个正方体物体叠放在水平地面上，已知两物体的边长之比是2：1，密度之比为3：2，A与B的质量之比为____，B对A的压强与A对地面的压强之比为____.

注意：1)词数100左右；

2)可以适当增加细节，以使行文连贯；

3)开头和结尾已给出，不计入总词数。

Dear Kenton,

    I am looking forward to your reply.

Yours sincerely,

Li Hua

   Bob was cutting a branch（树枝） off a tree in his garden. While he was sawing（锯）, another man passed in the street. He stopped and said, “ Excuse me, but if you continue (继续)to saw（锯） that branch like that, you will fall down with it.” He said this because Bob was sitting on the branch and cutting it at a place between himself and the trunk（树干） of the tree.
   Bob said nothing. He thought, “ This is some foolish（愚笨的） person who has no work to do and goes about telling other people what to do and what not to do.”
   The man continued on his way. Of course, after a few minutes. The branch fell and Bob fell with it.
   “My God!” he cried. “That man knows the future!” and he ran after him to ask how long he was going to live. But the man had gone.