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."
It can also be hard to interpret the results of testing finished products that contain lots of ingredients.
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This lets the caller pick a good size for the tasks slice, which may
常见操作如滚动、缩放图片与 PDF 文件，将获得与 iPhone、iPad 类似的流畅触控体验。但苹果不会强化触控打字能力，MacBook Pro 将保持全键盘设计和大触控板体验。
Photograph: Simon Hill