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Massage guns are often pitched at the highly active. They can help you warm up for workouts, accelerate recovery and generally keep things loose and injury-free. However, you don’t have to be training for an Ironman triathlon to benefit from a percussive pummelling. A good session can also alleviate the general soreness, stiffness and pain that comes from desk-bound days and the daily grind – all without having to cough up for a spell on a masseuse’s table or be handled by a stranger.
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But e-bikes containing lithium-ion batteries are a newer challenge. "When a battery fails, it doesn't necessarily ignite, it will often produce some off-gases," says Stephen Welch, senior lecturer at the University of Edinburgh's Fire Research Centre. "Those off-gases are toxic and flammable. If they accumulate, you can have an explosion risk."，更多细节参见同城约会
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