求翻译：但是有些学生却在校园中随意涂写，把雪白的墙壁上写满了密密麻麻的字，还随手乱丢垃圾，还有很多学生有随地吐痰的不好习惯是什么意思？

But some students at random graffiti on campus, the white walls filled with a dense word also readily litter, there are a lot of students have a bad habit of spitting

However, some students are on campus, feel free to write on the wall of the glacier white is full of words, and litter is also at your fingertips, there are also many students there are spitting bad habits

But some students at will spread actually in the campus write, has written all over the snow white wall on the dense and numerous character, but also randomly throws trash conveniently, but also has not the good custom which very many students have spit everywhere

But some students on campus free graffiti, packed on white walls filled with words, also readily litter, there are a lot of students have bad habit of spitting

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