二级根颈至苜蓿生长的第二年第二茬才出现；

Secondary crown did not appear until second cutting in the second year.

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结论膈神经根传导时间是评价与呼吸有关的颈神经根功能的不可缺少的电生理指标。

Conclusion PNRCT is an essential index to evaluate the involving nerve root function during respiration.

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结论膈神经根传导时间是评价与呼吸有关的颈神经根功能的不可缺少的电生理指标。

Conclusion PNRCT is an essential index to evaluate the involving nerve root function during respiration.

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