为方便购买，消费者会在心智中形成产品阶梯，当产生相对需求时，依序优羝先选购。

Customers swill form product ladders in their minds to facilitate. purchase. Thus, they can buy in this order when they need something.

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你提供的产品越简单，越多的有权力的顾客不得不购买或“销售解决方案的阶梯”，如果他们需要。

The simpler your offerings, the more power prospects will have to buy or "sell the solution up the ladder" if they need to.

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而且此产品的软密封结构的密封圈是由金属圈压套在阀座上的阶梯凹槽内，具有密封不脱落，而且可以很方便的更换等优点。

And the structure of the soft sealing ring of this product is pressed by a metal ring set in the seat within a groove on the ladder which can't drop and be convenient to change.

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