Know about backup flights on other airlines if the flight you're booked on is cancelled.了解一下，如果你预订了座位的那班飞机取消的话，可换乘其他航线的哪些航班。It's nice to have a change sometimes. Know what I mean?有时候改变一下真不错。 你明白我的意思吗？Know wot I mean?明白我的意思了吗？Know how to care for others and how to protect yourself even more.人心存良善，更应懂自保。