多指次品。
而相比之下，二级市场则涉及到通过私人交易商或拍卖行渠道对艺术品的转售倒卖。
The secondary market, by contrast, involves the resale of art objects, either through private dealers or auction houses.
工作对照品(也就是内部标准品或二级标准品)是根据一级对照品标定的，并用来代替一级对照品的。
A working standard (i. e., in-house or secondary standard) is a standard that is qualified against and used instead of the reference standard.
利用来自二级抽样的玉米品比试验资料，对抽样方案进行了讨论。
Making us of the datum of maize variety comparative test by twi-sampling, the sampling scheme was studied.
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