Yes? Yeah, so I'm saying when you fix theta you get only a half plane, not a full plane I mean, it goes all the way up and down, but it doesn't go back to the other side of the z axis. Why?

请说，所以我说当固定θ时,得到的是半平面，而非全平面,它布满z-轴的一侧,但从不延伸到z-轴的另一侧，为什么？

youdao

Supporting full HD 1080p of resolution, the AMD Z-60 APU delivers up to 10 hours of idle battery life, nearly eight hours of Web browsing and six hours of video playback(2).

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