but if only you could see
但如果你能看到
以上为机器翻译结果，长、整句建议使用 人工翻译 。
What if your security camera could not only see who's at your door, but also identify whether it's a guest you're expecting, alert you when they arrive, and let them in?
如果你的保安摄像机不仅能看到谁在你门口，还能判断出他们是否是你在等的人，从而通知你并让他们进来，会怎么样？
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