紫外线uv灯:Do you know ______ speaker of ______ Chinese language also has difficulty in learning Japanese?

Do you know ______ speaker of ______ Chinese language also has difficulty in learning Japanese? do you know about halloween's history? ---What do you know about the world's population ? Do you know? Do you know? Do you know 邵菁? DO YOU KNOW DO YOU KNOW Do you know? Do you know ？