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1.互帮互让，团结友爱
Be helpful and courteous to achieve harmonious solidarity.

2.勇敢的尝试是成功的一半
Fortune favors the brave.

3.微笑无需付出，却会得到丰厚的回报
A smile costs nothing but pays well.

4.保持校园安静，不喧哗追赶
Keep our campus serene; no din, no running, no altercation

5.学校是我家，清洁靠大家
Keep our school clean.

6.轻声慢步过走廊
Lower your voice and slow your pace in the corridor

7.轻声细语，举止文明
Be considerate, speak softly

遵守校规，做文明学生
Observes the school regulations; be a civilized student！

进入校园，请勿吸烟
Please not smoke in the campus

谦逊就是才智
Modesty equals intelligence

语言文明，礼貌待人
speak politely; be courteous with people.

再请斑竹帮忙指正一下这几条的翻译

遵守校规，做文明学生
Observes the school regulations; be a civilized student！

进入校园，请勿吸烟
Please not smoke in the campus

谦逊就是才智
Modesty equals intelligence

语言文明，礼貌待人
speak politely; be courteous with people

不敢指正的说.........
too prefessional...............