What is beautiful is not important. Because if someone unknown to our school, or never come. If an external user of older students Dirty stinking scum-filled with floating out from the inside our schools can make a bad reputation.
What is important is indispensable. If people who do not know our school or never. Assuming external unlikely to look old, dirty, full of trash. A foul odor coming from inside. Can make our school a bad reputation.
Beautiful thing is important, indispensable. Because if someone I don't even know our school or never. If you look old can't learn the dirty rubbish smells coming out from the inside.