英语翻译需要翻译的是：当我们遇到与我们擦肩而过却忘不掉的人时,请把它当作一段回忆留在心中

when we've met someone who is not destined to be the one yet leaves footprints in your life,don't linger around,make it an unforgettable memory deep inside your heart and move on.
过客终不是归人
伤情亦不如怀念