It is round when it is drawn,It is square when it is written

It is round when it is drawn,It is square when it is written 英语智力挑战题It is round when it is drawn.It is square when it is When.is.it? When is it now? it is when句型 有When is it When is it?快,、 It is clean when it is black. It is written 是什么意思 it is written It is written 英译汉 猜谜语：It is clean when it is black.It is dirty when it is whit