[译] 许多店主承诺让顾客满意。
[误] Many shopkeepers guarantee satisfaction to guests.

[正] Many shopkeepers guarantee satisfaction to customers.
[注] 在商店中，前来购买的人应该用 customers（顾客）来表示，而不是 guests。guests 专门指家庭的来客、旅馆的旅客，饭店的食客等。如：We invited two guests to dinner in our house. 我们邀请了两位客人到家里来吃饭。