Recently I was walking in town when I saw a group of school

Recently I was walking in town when I saw a group of school students in uniform.求翻译!急急急急
Recently I was walking in town when I saw a group of school students in uniform. I was shocked to see that the girls's skirts were very short and they were wearing a lot of make-up. The boys looked very untidy. Their shirts were dirty and some of them even had their shirtfronts open. I noticed too that some of the students had pierced ears and noses, which I don't think should be allowed at school.
　　And the other day, I was riding on the subway when I saw some boys from a local school. I know they were from this school because they were wearing the same uniform as my children. Instead of sitting quietly, these boys were making a lot of noise, chewing gum in an ugly manner, and using bad language. All the other passengers were looking at them and wondering how it was possible for these boys not to have any self-respect(自尊). They were also giving their school a very bad image(形象), which is shameful(羞耻的).
　　I am a mother of two teenagers at this school and I am worried that my children also behave like this and I do not know about it. Do school students know what is allowed and what is not allowed when they are wearing their school uniform? I think the school should be stricter with the students. (1) And I think all students should be taught how to be polite.

最近当我在小镇里行走的时候,我看见一群穿着制服的学生.当我看到那些女孩的裙子非常短,并且她们用了很多化妆品时,我很惊愕.那些男生们看起来很不整洁.他们的衬衣很脏,而且他们中的一些人的衬衫胸部是敞开的.我还注意到,一些学生带着耳钉和鼻钉--- 我认为这些是不应该被学校允许的.
另一天,我在乘坐地铁的时候看到一些来自一所当地学校的男孩.我知道他们是来自那所学校的因为他们穿着的制服跟我的孩子一样.那些男孩没有安静地坐着,而是发出很多噪声,用一种很丑陋的方式嚼着口香糖,使用不文明的语言.所有其他的乘客都在看着他们,并惊讶这些男孩怎么会没有自重/自尊心.他们也给他们的学校树立了一个坏的形象--- 这是令人羞耻的.
我是两个在这所学校上学的青年的母亲,我很担心我的孩子也表现成这个样子而我并不知情.这些学生们知道他们在穿着制服的时候什么样的行为是被允许的,什么样的行为是不允许的吗?我觉得学校应该对这些学生更加严格一些.而且我觉得所以学生都应该被教会如何做是礼貌的.
纯手工翻译.
有问题欢迎追问.