“spragger”的概念、定义、翻译、参考文献-科学参考

单词	spragger
释义	spragger [`sprag·ǝr] ^{MINING ENGINEERING} In coal mining, a laborer who rides trains of cars and controls their free movement down gently sloping inclines by throwing switches and by poking sprags between the wheel spokes to stop them.
随便看	oak oakmoss resin oakum oak wilt O antigen oasis OASM system oat oatmeal paper O attenuator OBA OB association obclavate obcordate obdiplastemonous obduction obelion obelisk Obermayer's reagent Oberon oberwind obese obfuscation object object code

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