例句：

　　He dismissed the opinion polls as worthless.

　　他認(rèn)為民意測(cè)驗(yàn)毫無(wú)用處而不予考慮。

　　Training is worthless unless there is proof that it works.

　　訓(xùn)練并無(wú)價(jià)值，除非證明其有效。

　　An agreement is worthless till our name is written with a pen.

　　除非用筆把我們的名字寫(xiě)下來(lái)，否則協(xié)議毫無(wú)價(jià)值。

　　The closure left 500 people jobless.

　　這次倒閉使500人失業(yè)。

　　They joined the ranks of the jobless.

　　他們加入了失業(yè)大軍。