Dynamic characteristics of collaborated system mainly include natural vibration frequency and principal mode, which is the base and precondition of dynamic analysis for collaborated system.

协作体系的动力特性主要包括体系的自振频率和主振型，它是协作体系结构动力分析的基础和前提。

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Cereals: refer to seeds of various kinds of crops which are used mainly for grain. cereals include paddy wheat maize millet chinese sorghum etc. except beans and tubers .

谷物：指籽实主要供作粮食的作物。这类作物包括稻谷、麦、米、子、粱和其他谷物，不包括豆类和薯类作物。

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The actions of crime of transnational cyberspace mainly include crimes which take the Internet as object, which take the Internet as tools, and some other crimes which are relative to Internet.

跨国性网络犯罪行为主要包括以互联网为对象实施的犯罪、以互联网为工具实施的犯罪和其他与互联网关联的犯罪。

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These include transmission networks as well as hydroelectric and thermal-power projects which needed clearances mainly from the environment ministry.

WSJ: India Clears Projects Worth Several Billion Dollars

That agency mainly acts to ensure that products are made according to good manufacturing practices, which include potency, cleanliness, and stability, that ingredients are generally safe, and that companies are not making unsubstantiated claims about curing or treating disease.

CNN: How can I pick the healthiest brand of red yeast rice?