在这20 个研发收缩的行业中，超过半数行业（11 个）披露研发投入的企业数量仍在增加，可能存在整体研发投入的结构性调整。
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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."