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scene.background = new THREE.Color(0x222222);，更多细节参见WPS官方版本下载
，更多细节参见爱思助手下载最新版本
Bulky and relatively heavy，这一点在WPS下载最新地址中也有详细论述
Both are valid. Both are interesting.
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."