Don't pine and cypress suffering from cold have the nature to praise what character and ambition?

the lofty quality of the firm and unyielding high moral integrity of pine trees. The poet "Don't suffer from cold, pine and cypress have nature" from the outside to the inside, from the surface to the deep, from the "slim" and "correct" appearance to the inner nature of pine trees, thus showing that pine trees are not afraid of the wind and cold, and praising the lofty quality of pine trees' unyielding integrity. This sentence comes from Liu Zhen's "Gift from Brother II" in the Han Dynasty.