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Мощный удар Израиля по Ирану попал на видео09:41
圖像加註文字，外籍移工上街爭取在台灣久留的勞動政策。長遠之道
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."