“hard hat”的概念、定义、翻译、参考文献-科学参考

单词	hard hat
释义	hard hat [`härd ´hat] ^ENGINEERING A safety hat usually having a metal crown; used by construction workers and miners.
随便看	achiasmate achievement age achievement quotient achilary Achilles Achilles group Achilles jerk Achilles tendon Achilles tendon reflex achiral molecules achlamydeous achlorhydria achluophobia Acholeplasma Acholeplasmataceae acholia achondrite achondroplasia achondroplastic dwarf achordate achreocythemia achroglobin achroite achromasia achromat

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