Never stop smiling, not even when you are sad, someone might fall in love with your smile.
永远都不要停止微笑，即使是在你难过的时候，说不定有人会因为你的笑容而爱上你。
protection for sb 保护
protest against sth 抗议
against sth provision for/against 准备
pull at/on sth 拉,拖
ratio of sth to sth 比率
reaction to 对……的反应
reason for 原因,理由
