“North American Nebula”的概念、定义、翻译、参考文献-科学参考

单词	North American Nebula
释义	North American Nebula [`nȯrth ǝ`mer·i·kǝn `neb·yǝ·lǝ] ^ASTRONOMY A cloud of dust and gas in the constellation Cygnus; the density of this gas and dust is possibly a thousand times greater than the average density of interstellar gas; a much denser cloud of dust between the nebula and earth obscures portions of the emission nebula to create the appearance of the ``Gulf of Mexico'' and the ``Atlantic Ocean.''
随便看	constant-current filter constant-current generator constant-current modulation constant-current source constant-current supply constant-current titration constant-current transformer constant-delay discriminator constant-deviation fringes constant-deviation prism constant-deviation spectrometer constant-distance sphere constant-effect model constant element constant-false-alarm rate constant field constant-force spring constant-gradient synchrotron constant guidance constant-head meter constant-height chart constant-height surface constant instruction constant-k filter constant-k lens

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