adj.無(wú)效果的;徒然的;空的
They have been unfruitful in their efforts. 他們都徒勞而歸。
This kind of video does not have commercial value, unfruitful raise bandwidth cost. 這類(lèi)視頻沒(méi)有商業(yè)價(jià)值,又徒然增加帶寬成本。