“root penetration”的概念、定义、翻译、参考文献-科学参考

单词	root penetration
释义	root penetration [`rüt ´pen·ǝ´trā·shǝn] ^METALLURGY The depth of penetration of the weld metal into the root of a joint.
随便看	nidicolous nidus niello Niemann-Pick disease nieve penitente NIF niggliite night night ape night blindness night effect nightglow night order book night-sky camera night-sky light night-sky luminescence night sweat nighttime visual range night vision night-vision binoculars night-vision telescope night visual range night wind nigre nigrescent

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