rear focus surface 后焦面
surface focus 地表震源
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One of the great usability benefits of this design is that the iWatch could sense body position and orient the focus of the visible surface towards the user.
FORBES: The iWatch As Snap Bracelet? Apple Just Got The Patent.
If they want to focus on boosting the case for Surface and for OEM-built Win 8 tablets, they will hold back.
FORBES: Microsoft: Don't Expect Office For iPad In The Near-Term
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