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 didn't know whether to send the letter airmail or not.
我不知道是否送航空邮件。
That's right. We will take 10 pigs, 10 sheep and sixty chickens. The chickens can eat the food that we would otherwise throw away. They will provide us with eggs and meat.