单词	beast of burden
释义	beast of burden noun phrase : an animal employed to carry heavy loads or to perform other heavy work (such as pulling a plow) Word History First Known Use 1740, in the meaning defined above
随便看	pteridology pteridophilists Pteridophyta pteridophytae pteridophytas pteridophyte pteridophytes pteridophytic pteridophytous pteridosperm Pteridospermae pteridospermaes Pteridospermaphyta pteridospermaphytae pteridospermaphytas pteridospermaphytic pteridospermopsidae pteridospermopsidas pteridospermous pteridosperms Pteriidae pteriidaes pterin pterins Pteris

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