Pine has no ancient and modern colors, and bamboo has upper and lower knots.

"pine has no ancient and modern color, bamboo has upper and lower knots" is a philosophical poem, which is often used to compare people's character. Pine trees are the same color no matter when they are born, while bamboo has the character of tying knots up and down. This tells us that people's character will not change with the changes of the times, and we should keep our moral integrity and character whenever and wherever.

This poem also expresses a lofty sentiment and moral pursuit. Pine's "no color of ancient and modern" represents a firm and consistent character, while bamboo's "upper and lower knots" symbolize people's integrity and integrity. This kind of sentiment and moral pursuit is worth learning and pursuing.

In short, the poem "pine has no ancient and modern colors, bamboo has knots" tells us that human character is an eternal value. No matter how the times change, we should keep our moral integrity and character and constantly pursue lofty moral goals.