Theory is gray, and the tree of life evergreen.

理论是灰色的，而生活之树常青。

youdao

As Goethe says "the theories is gray, the tree of life is evergreen."

正如歌德所言“理论是灰色的，生命之树常青。”

youdao

As Goethe says "the theories is gray, the tree of life is evergreen."

正如歌德所言“理论是灰色的，生命之树常青。”

youdao