mean astronomic meridian plane

例句：

1. 1. He meant to tell me the truth, but he forgot.
   他本意是要告诉我真相，但他忘记了。
2. 2. The meaning of life is to live it fully.
   生活的意义在于充分地生活。
3. 3. The book means a lot to me.
   这本书对我来说意义重大。