It's summer. Mantis was born. The bird began to sing. The tongue is silent. What does this mean?

It's summer now. Mantis was born. The bird began to sing. The tongue is silent. The phonological calendar used to guide agricultural activities in ancient China also comes from Huai Nan Zi Shi Ze Xun compiled by Liu An in the Han Dynasty. Modern Chinese means: solar terms come, mantis is born, shrike begins to crow, but bitter ancestors are lonely and silent.