第三，是高竞争壁垒。在纯模型能力趋于同质化的当下，硬件构成了最直观的差异化壁垒。优秀的工业设计、紧密的软硬结合能力、独特的传感器阵列、乃至与时尚品牌的联名，这些要素共同构成了一个可被专利保护、难以被代码简单复制的物理实体。
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.
。业内人士推荐同城约会作为进阶阅读
const writable = getWritableStreamSomehow();
* @param arr 待排序数组