产品使用指南主要用于说明产品的性能，特点，应用及用法。
Product User Manual is mainly used to explain the product's performance, characteristic, application and usage.
恩恩，是未来适用法，变更后应用与变更日及以后。
New signature thresholds will only be applied to petitions created after the changes are made.
恩恩，是未来适用法，变更后应用与变更日及以后。
New signature thresholds will only be applied to petitions created after the changes are made.
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