... 一级风 light air 一级根 root of the first order 一级机 single-level machine ...
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root of the first order
一阶的根
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The article educed that the series of hard wheat futures and spot prices show their first-order difference stationary, I (1) process, by the unit root test.
通过单位根检验，确定硬麦期货与现货价格序列具有一阶差分平稳性即i(1)过程。
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