“extravehicular activity”的概念、定义、翻译、参考文献-科学参考

单词	extravehicular activity
释义	extravehicular activity [¦ek·strǝ·vǝ`hik·yǝ·lǝr ak`tiv·ǝd·ē] ^{AEROSPACE ENGINEERING} Activity conducted outside a spacecraft during space flight.
随便看	pulse-width modulation pulse-width modulation-frequency modulation pulse window pulsing key pulsing transformer pulsometer pultrusion pulverite pulverization pulverizer pulvillus pulvinus puma pumice pumice fall pumiceous pumice stone pumicite pumilith pump pumpability pumpability test pumparound pump bob pump-down time

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