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[VOA慢速] VOA慢速精精听2019-02-06

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1# ellyxia Scientists have long attempted to find materials to make batteries that are more powerful but cost less to bulid. In the United States, researchers are experimenting with soldium to see whether it can power much improved batteries in the future. Soldium is a soft and silvery medal. It is plentiful

[Homework]VOA慢速精精听2019-02-06

Scientists have long attempted to find matterials to make batteries that are more powerful but cost less to build. In the United States, reserchers are experimenting with sodium to see whether it can power much-improved batteries in the future. Sodium is a soft, silvery medal. It is plentiful and found in seawater. The most common battery used today is made of lithum  ion. These battries power everything from smart phones, to computers to eletrical vehicles.
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