Lincoln's sigh, quoted above, is a bit of an old chestnut.

在上文中引用的林肯的叹息有点老生常谈。

The Golden Rule ("do unto your customers…") is an old chestnut of the marketing world.

黄金法则（“对待你的客户”）是营销界非常古老的一条法则。

The Golden Rule (" do unto your customers... ") is an old chestnut of the marketing world.

黄金法则(“对待你的客户”)是营销界非常古老的一条法则。