to hand down

• 少林镇寺之宝《易筋经》，是少林秘传的救市良方。

  The most precious treasure of Shaolin Temple, the Tendon Change Classic, is an effective prescription to save the people of the city, handed down from generation to generation in the temple.

• 过去拜师学艺只能秘传口授，极少笔录。

  In the past when studying an art as a master's apprentice, knowledge could only passed down orally, with very few written records.