有必要用一个备用部件来替换它。

It will be necessary to replace it with a spare unit.

youdao

同样不需要为多个系统储备许多备用部件，只需为一个单一平台留有备件即可。

Also, rather than needing to stock replacement parts for multiple systems, only spares for a single platform are required.

youdao

运用泛函分析的方法 ，通过分析系统主算子的谱特征 ，给出一类具有备用部件的可修人机系统解的渐近稳定性证明 。

By using functional method, the asymptotic stabitity of a solution of a repairable standby human-machine system is proved, by studing spectral properties of the operator corresponding to this system.

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