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."
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宋高祖也向BBC強調，德國總理對北京的言辭與語調或許會趨於柔和，但不太可能出現對華政策從謹慎與「去風險化」的大幅轉向。「主要結構性障礙——包括中國與俄羅斯的結盟以及其產能過剩問題——至今仍未找到雙方都能接受的解決方案。」