They mean long life. I remember you liked the calligraphy at the Palace Museum.
长命百岁。我记得上次去故宫,你特别喜欢书法。
I ask him to tell me the truth about everything.
我要求他告诉我每件事的事实。
Yet, in real life, circumstances do sometimes conspire to bring about coincidences which anyone but a nineteenth century novelist would find incredible.