I had a similar experience later while crossing the ocean. I had an attack of lumbago so severe that I could not walk. I suffered extreme pain when I tried to stand up straight. While in that condition, I was invited to give a lecture on shipboard.

后来我在渡海的时候也有过类似的经历。我腰痛得厉害，不能走路。当我试图站直时，我感到极度疼痛。在那种情况下，我应邀在船上进行了演讲。