上說

In a sentence

• 在课本上说，这个公式很重要。

  The textbook says this formula is very important.

  Here, '上说' is used to indicate the information stated in the textbook.

• 专家们在会议上说，我们需要新的方案。

  Experts said at the meeting that we need a new plan.

  Here, '上说' refers to something mentioned or stated during the meeting.

• 在广告上说，这种产品可以减轻压力。

  The advertisement says this product can reduce stress.

  Here, '上说' conveys information presented in the advertisement.