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维护老客户关系，开发潜在市场；
Maintain relationships for existing customers, develop potential market.
youdao
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开发新客户，维护老客户。
Develop new customers and maintain old customers.
youdao
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维护老客户，在分配的应用领域或者区域开发新客户。
Maintain and implore potential customers in assigned application field or area.
youdao