慢速英语:Batteries That Last Forever Could Be Near

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battery - n. a device that is placed inside a machine (such as a clock, toy, or car) to supply it with electricity

frustrated - adj. very angry, discouraged, or upset because of being unable to do or complete something​

degrade - v. to make the quality of (something) worse

outlet  - n. a device in a wall into which an electric cord can be plugged in order to provide electricity for a lamp, television, etc​

lithium-ion battery- n. a rechargeable battery often used to power electronics

gel  - n. a thick substance that is like jelly and that is used in various products​