一天早上,我刷过牙后,看见水槽里残留着一小块儿牙膏。看看其他同学的情况,也都是这样。那些牙膏渣就像大大小小的虫子爬满了水槽,真是又浪费又难看。牙膏为什么会这样被浪费呢?我找来牙膏与牙刷,经仔细观察发现,这主要是由于牙膏口的形状所致。现在的牙膏全都采用圆形的开口, One morning, after brushing my teeth, I saw a small piece of toothpaste in the sink. Look at the situation of other students, too, are the same. Those toothpaste residue is like a large and small bugs filled the sink, really wasteful and ugly. Why is toothpaste so wasted? I find toothpaste and toothbrush, after careful observation found that this is mainly due to the shape of the toothpaste mouth. Now toothpaste all use circular openings,