显然，这些顾客要么是分不清黄油和人造黄油，要么就是用“黄油”这个词来指黄油或人造黄油。

Clearly, either these customers cannot distinguish butter from margarine or they use the term "butter" to refer to either butter or margarine.

youdao

使用最可能保留这些顾客的战术。

Employing those tactics most likely to retain these customers.

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不过这些顾客并不知道有人在观察他们。

The men did not know they were being observed.

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