In theory, only those customers likely to buy were targeted with marketing activity, reducing costs and increasing marketing efficiency.

从理论上来讲，市场营销只会面向潜在客户群，以此降低成本、增加营销效率。

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In addition, higher tax rates now or in the future increase the barriers to domestic economic activity, thereby further reducing economic activity and employment.

FORBES: Job Creation, Economic Growth And Social Justice

Beta blockers work by reducing activity in the sympathetic nervous system, which is one of the two major branches of the body's stress (or fight-and-flight) system.

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The activity contributes to reducing sexual transmission of HIV and empowering young people and other citizens with knowledge and skills to protect themselves from new HIV infections.

UNESCO: MEDIA SERVICES