快餐的问题在于它不健康。

___The ___trouble ___with fast food is that it's unhealthy.

社交媒体的麻烦在于它可能让人上瘾。

___The ___trouble ___with social media is that it can be addictive.

公共交通的麻烦在于它经常延误。

___The ___trouble ___with public transport is that it's often delayed.