一.on the paper的有关句子
The ink blot ted on the paper.
墨水把纸弄脏了.
The artist flowed the washes on the paper.
画家使墨流动在纸上.
二.at th paper的相关句子
She looked at the examination paper with a frown.
她皱着眉头看试卷.
The fellow next to me wrote his name at the top of the paper.
坐在我旁边的那个人在考卷顶上面写了自己的名字.
你自己可以通过这两个句子理解一下其中的含义.