Because selling of the home air conditioner trade has the obvious seasonal characteristic, its distributor management presents periodic return.

由于家用空调行业销售具有明显季节性特点，其经销商管理呈现周期性循环的特点。

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After-sales service personnel to track to sell products, and make detailed records, periodic return visits in order to always listen to your Calls, so you get 100% satisfaction.

售后服务人员跟踪售出产品，并作详细记录，定期回访，以便时刻聆听您的召唤，使您得到百分之百的满意。

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One strategy to ensure that users return to the site at periodic intervals is to offer them fresh information from time to time.

确保用户隔一段时间就回到网站的一个策略就是不断地向他们提供新信息。

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For example, large cap stocks have historically returned about 9% per annum in the U.S., but due to the new market realities, of slow growth, heightened volatility, punctuated by periodic financial crisis, an annual return estimate of 6% to 8% for a large cap stock portfolio might be more realistic.

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Even though protection under either the public or private system is not 100% certain, at least beneficiaries in the private system received periodic reports on their funds and had the ability to seek the best return.

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