Update announcement_6.md

Author: BingCS

_news/announcement_6.md

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-Several fully funded PhD/RA positions for 3D Vision/Robot Learning are available now. Email me with your CV and transcripts!
+Invited as a [Technical Papers Committee Member (Area Chair)](https://asia.siggraph.org/2025/about-the-event/siggraph-asia-2025-committee/technical-papers-committee/), and also serving as [Session Chair @ 4D & Dynamic Scene Generation and Reconstruction](https://dl.acm.org/doi/proceedings/10.1145/3757377?tocHeading=heading19) in December 2025 for [SIGGRAPH Asia 2025](https://asia.siggraph.org/2025/)!