golden key是个什莫组织？收到好几次这个地方的email了，说让参加，要不然就过了
dead line 云云。请知道的指教一二。谢谢。
xx：
We recently sent you an invitation to join Golden Key International Honour
Society. Your initial deadline to join has passed and according to our
records you have not yet chosen to accept our invitation........
