求翻译：但关系营销是一把“双刃剑”，由于长期的“关系”带来收益的同时，也有不可忽视关系的成本和负面作用。关系营销的应用必须具备一些条件，在效益与成本之间、长期与短期现金流等方面达到平衡。是什么意思？

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However, relationship marketing is a "double-edged sword." Because of the long-standing relationship between the " " bring in revenue, while the cost and negative role relations cannot be ignored. relationship marketing applications must have certain conditions, in terms of effectiveness and cost, l

But the relational marketing is “the double-edged sword”, because long-term “the relations” brings the income at the same time, also has the noticeable relational cost and the negative function.The relational marketing application must meet some requirements, between the benefit and the cost, long-t

Relationship marketing is a "double-edged sword", as the term "relationship" benefit at the same time, also not ignore the relationship between costs and negative effects. Relationship marketing application must have a number of conditions, between the benefits and costs, long-term and short-term ca

But it is a " double-edged sword " that the relation is marketted, because while long-term " relation " brings incomes, can't ignore cost and negative function concerned either. Must last some terms,whose name is between benefit and cost, cash flows long-term short-term,etc. respect last equilibrium