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Finally, a 1 kW electric radioisotope power supply running on Plutonium 238 (Pu-238) would kick in to power an ion thruster engine.
FORBES: Jump-Starting A Mission To Interstellar Space
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。