7. I believe in the maxim "if it ain't broke, don't fix it."
我相信这句格言:“如果它没坏,不要去修理它。”
《柯林斯英汉双解大词典》
8. "Nature gave us lips to conceal our teeth," ran one popular Victorian maxim, alluding to the fact that before the birth of proper dentistry, mouths were often in a shocking state of hygiene.