解释：大树不能生长在屋脊上，松柏不能生长在矮墙上。

Concerning the gods, I have no means of knowing whether they exist or not or of what sort they may be. Many things prevent knowledge including the obscurity of the subject and the brevity of human life.

切割金属艺术的第一步是找到一个具备必要技能和经验的人。