白色地板的问题在于它很容易脏。

___The ___trouble ___with a white floor is that it gets dirty so quickly.

约翰的问题在于他说话不经过思考。

___The ___trouble ___with John is that he doesn't think before he speaks.

骑自行车的问题在于如果下雨，你可能会被淋湿。

___The ___trouble ___with cycling is that you can get wet if it rains.