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	thermal thermal agitation thermal ammeter thermal analysis thermal barrier thermal belt thermal black thermal conduction thermal conductivity thermal converter thermal cracking thermal cutout thermal diffusion thermal diffusivity thermal efficiency thermal effusion thermal electromotive force thermal energy thermal equator thermal equilibrium thermal expansion thermal head thermal inertia thermal insulation thermal ionization

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