1. The stair treads were covered with rubber to prevent slipping.
楼梯踏板上覆盖着橡胶以防滑.
2. The teacher is cleaning the blackboard with a board rubber.
3. Some of the prisoners were beaten about the head with rubbertruncheons.
一些囚犯头部遭到橡皮警棍的击打.
4. Now they wear rubber fingers treated with lactic acid.
现在他们带上了用乳酸处理过的橡皮指套.
5. If plastic and rubber are burnt, they'll give off poisonous gases.
要是塑料和橡胶被焚, 就会放出有毒的气体.
6. The government bought up the whole domestic rubber crop.
政府买进国产的全部橡胶.