Only when the above-mentioned four are grasped, can study obtain the direction, reference the base, understanding the clue and operation the law.

只有抓住这四条主线去学习参悟，才能学有方向，参有基础，悟有契机线索，运化有规律可循。

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The method can provide a reference for the material base research and quality control of the decoction of Rhizoma Polygonati.

该方法可为黄精物质基础研究与质量控制提供参考。

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Official PPI data based on the current reference base are not available on previous index reference base periods.

基于当前参考基准的官方生产者物价指数数据在以前的指数参考基准期是不可用的。

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These sites function as reference material for journalists, but also bleed over to the curious customer base.

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