优点：输出范围在 (0,1)，可以表示概率
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There have been some modular phones released to the real world, but they weren't nearly as ambitious as Tecno's concept. LG launched a semi-modular phone called the G5 back in 2016, but it didn't move too many units. Moto has also released a couple of semi-modular smartphones, but they didn't set the world on fire.，更多细节参见同城约会
Ok, but you still don’t want to have to change your API to add this