慢速英语:Research Breakthrough for Biodegradable Tires?(翻译)

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短语讲解：

1. This was combined with a polymer to make a substance very similar to natural rubber.

be combined with 与…结合着
例句：In English study, intensive reading must be combined with extensive reading.
在英语学习中，精读必须与泛读结合起来。

2. For one thing, they were able to recover 100 percent of the original materials when the rubber decomposed.

be able to 能够; 能
例句：He will be able to take up his normal routine shortly.
他不久就能处理日常事务。