只用一本书提高英语听力能力!重温经典名著双语阅读小编推荐:跟着纪录片学英语不背单词和语法,轻松学英语
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[VOA慢速] VOA慢速精精听2019-02-06

提高英语听力能力 找对方法很重要!
Scientists have long attempted to find materials to make batteries that are more powerful but cost less to build. In teh United States, researchers are experimented with sodium to see whether it can power much improved batteries in the future. Sodium is a soft silvery metal. It is plentiful and found in sea water. The most common battery used today is made of * *. These batteries power everything from smart phones to computers, to electric vehicles.
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