What's this挑战，你答对了几个？
目前是广告占位区域
What's this?
It's a bench.
What's this?
It's a drain.
What's this?
It's a fountain.
What's this?
It's a trash can.
What's this?
It's a bench.
What's this?
It's a drain.
What's this?
It's a fountain.
What's this?
It's a trash can.