Think about it. That little boy who's running back into his house, he may have a nice, clean fresh water supply, but he's got dirty hands that he's going to contaminate his water supply with.
بهش فكر كنيد. آن پسر كوچولو كه دوان دوان به خانه اش بر مى‌گردد، ممكن است كه منبع آبى تازه، تميز و خوبى داشته باشد، اما دستان كثيفى دارد كه با آن منبع ذخيره آبى را آلوده مى‌كند.