早晨，有三個小弟弟在公園里的草坪上踢足球，這時，一位小姐姐過來了，她對三個小弟弟說，不要在草坪上踢足球，踩疼了小草，小草就會很傷心的，我們要愛護草坪。那三個小弟弟就低下了頭 ，對小姐姐說，我們以后不在草坪上踢足球了。

In the morning, there are three little brothers playing football on the lawn in the park. At this time, a little sister comes here. She says to the three little brothers, don't play football on the lawn. If you step on the grass and it hurts, the grass will be very sad. We should take good care of the lawn. The three little brothers bowed their heads and said to the little sister," we will not play football on the lawn in the future.".