radioactive power sources
... 推进动力源 propulsive power source 放射性动力源 radioactive power sources 磁流动力源 magnetohydrodynamic source ...
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为先驱者号们提供舱内热动力源的钚238会有放射性衰变,其发射量会随着时间的推移而越来越小。
As the plutonium-238 that served as the Pioneers' onboard heat source radioactively decayed, it would have emitted less heat over time.
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