What do you mean by making a sound?

The significance of lei nai's vocal music

March 26th to 30th is the day when "Lei Nai speaks", and it is also February 22nd to 26th of the lunar calendar.

Yi Zhoushu said, "The mysterious bird has arrived. On the fifth day, Lei Nai made a sound. He said, "If Lei doesn't make a sound, the vassal will lose his man. ".

Then there was thunder. That is, the cloud activity in the sky began to become active.

The name is not difficult to understand, that is, lightning appeared in the sky at this time.

Twenty-four solar terms say: thunder is sound: thunder is the sound of yang, and it can't go out in the shade, so thunder is exciting. Twenty-four solar terms in Yuan Dynasty said: thunder is sound, yin and yang are thin, and it is thunder. At this point, the four yang are gradually flourishing, and there is still yin, so the thinness is the sound, and the rhyme must say: it is difficult to exhale.