These electrons get funnelled into a metal spherical receiver to produce a current, which generates the wire's magnetic field - making the system self-sustaining.

这些电子被引入一个球形金属收集器以产生电流，继而产生线圈的磁场——这样这个系统就可以自我维持了。

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Still, success was partial unless the oysters could reproduce, paving the way for a self-sustaining system.

FORBES: Oysters Are Back In New York City Waters

Their solution is to create a financially self-sustaining public toilet system.

FORBES: Let's Stop Overlooking Systems Innovations