Only minimal training is required and no external power, electricity, equipment, clean water, or sterile environment is needed.
它只需简单培训，又无需外部能量、电、设备、干净的水或无菌环境。
It requires no external power sources, thereby reducing operation costs.
无需额外动力，节省运行成本。
This also means that there is no external power that produces the arising and the cessation of dukkha.
这也意味着没有外面的力量来产生或终止苦难。
In the case of a mechanical switch, this circuit would require no external power to implement this function.
在机械开关的情况下，电路不需要外部电源实现这个功能。
In the case of a mechanical switch, this circuit would require no external power to implement this function.
在机械开关的情况下，电路不需要外部电源实现这个功能。
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