词汇	toil with no gain
释义	toil with no gain 劳而无功
随便看	quercus nuttallis Quercus,or,to the uninformed layman,the oak… Quercus, or, to the uninformed layman, the oak… Quercus oxyodon Quercus oxyphylla Quercus pachyloma Quercus palustris quercus palustriss quercus pannosa Quercus pannosa quercus pannosa hand-mazz Quercus pannosa Hand.-Mazz Quercus patelliformis Quercus petraea quercus petraeas Quercus phellos quercus phelloss Quercus phillyraeoides quercus philly-raeoides a.gray Quercus phillyraeoides community Quercus phillyraerides A.Gray Quercus Phillyreoides quercus phillyrioides Quercus prinoides quercus prinoidess