1. The stair treads were covered with rubber to prevent slipping.

　　樓梯踏板上覆蓋著橡膠以防滑.

　　2. The teacher is cleaning the blackboard with a board rubber.

　　老師正在用黑板擦擦黑板.

　　3. Some of the prisoners were beaten about the head with rubbertruncheons.

　　一些囚犯頭部遭到橡皮警棍的擊打.

　　4. Now they wear rubber fingers treated with lactic acid.

　　現(xiàn)在他們帶上了用乳酸處理過(guò)的橡皮指套.

　　5. If plastic and rubber are burnt, they'll give off poisonous gases.

　　要是塑料和橡膠被焚, 就會(huì)放出有毒的氣體.

　　6. The government bought up the whole domestic rubber crop.

　　政府買(mǎi)進(jìn)國(guó)產(chǎn)的全部橡膠.