- marginal customer
- 指: finger
- 额外: extra; additional; added
- 的: 4次方是 The fourth power of 2 i ...
- 客户: connection; custom; customer ...
- 额外的: additional; extra a. beyond what is usual or necessary; extras; odd; supererogatory; superfluous; supernumerary; superunmerary; x,x. extra
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