（一）已满十四周岁不满十六周岁的；
For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
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50MP main, 12MP ultrawide, 10MP 3x telephoto
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