der(R1 · R2) = der(R1) · R2, plus der(R2) if R1 is nullable
If I’m a company developing software, who needs that headache? Particularly in a litigious society. There may be societal benefits to copyleft code – that is the Free Software Foundation’s argument – but there is zero benefit to a commercial software publisher or distributor.
。关于这个话题，wps提供了深入分析
Here are the tricks I came up with:
"It meant it was possible to capture a nearly 180 degree field of view, so you could almost capture them like a string of pearls in the sky."
再往前看一点：Gemini 智能体甚至不只局限于 AI 手机。在 Sammer Samat 设想中，未来智能眼镜、AI 吊坠，甚至是汽车，只要有 Gemini，就能用它来完成复杂的任务——当然，这样的场景距离落地还有距离。