例句：
He dismissed the opinion polls as worthless.
他認為民意測驗毫無用處而不予考慮。
Training is worthless unless there is proof that it works.
訓練并無價值，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下來，否則協(xié)議毫無價值。
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。