优点：计算简单，导数恒为1（正区间），缓解梯度消失
在过去的很长一段时间里，麦当劳与肯德基几乎成为了商场的“基础设施”，这种渠道策略锁定了消费层次丰富且人流量较大的中腰部商业体。
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Agar is so critical that since WWII, scientists have tried to find alternatives in the event of a supply chain breakdown, especially as recent shortages have caused similar alarm. But while other colloid jellies have emerged, agar remains integral to laboratory protocols because no alternatives can yet compete on performance, cost, and ease of use.，这一点在夫子中也有详细论述
New fear unlocked: Your robot vacuum as a spyEven with this issue fixed, the idea that someone could spy on you via your robot vacuum doesn't exactly boost confidence in the whole category. What if another brand of camera-toting robot vacuum brand has a similar undiscovered security flaw — and what if the person who discovers it isn't as goodhearted as Azdoufal?