The principle was established with designing the capability of heating equipment according to the peak heating load in greenhouse and deciding fuel store by total heating load in a period of time.

确立了依据最大采暖负荷设计采暖设备的容量，依据期间采暖负荷决定每个采暖期的燃料储备的原则，并给出了温室供热系统的设计程序。

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The principle of reuse belongs to the process methods. Its purpose is to extend the using time period of products.

再利用原则属于过程性方法，目的是延长产品和服务的时间强度；

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For instance, no interest loans allow buyers to pay against the principle only on the loan for a period of time.

比如，免息贷款，让买家支付反对原则，只有在贷款一段时间。

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But the general principle still stands: what you pay over in actual cash in this time period is not the tax that is due from this time period.

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