达尔文所说的物种生存的目的是为了繁衍是很有道理的，因为植物体所产生的次级化合物(secondary compound)，经常是为了不被动物吃掉，毒死他或变的不好吃。
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... secondary articulator 次发音器官〔指鼻腔〕 secondary compound 二次复合词；再生复合词 secondary derivative 次衍生词；再度派生词 ...
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plant secondary compound 植物次生化合物
resistant secondary compound 抗原次生化合物
secondary nitro-compound [化学] 仲硝基化合物
compound secondary 复合次级
compound secondary linear motor 复合次级直线电机
We keep only a compound primary key and a secondary index for each row, and answer all queries from a single index.
我们只保留了一个组合主键和一个辅助索引来完成所有的查询。
For chemical compound flooding, it emphasizes the combination among core study, numerical simulation and pilot test, and secondary mechanism study in the view of reservoir engineering.
在化学复合驱方面，强调岩心、数模和矿场试验紧密结合，从油藏工程角度开展二次机理研究。
There exits a compound error problem in the electrical measurement, which is composed of PT synthetic error, ct synthetic error, electrical energy measurement error and secondary potential of PT.
电能计量综合误差是由电压互感器的合成误差、电流互感器的合成误差、电能表的误差、电压互感器二次导线压降所引起的计量组成。
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