锁口
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barrel locking notch 枪管锁坑
The profile design adopts European standard hardware notch to connect many locking points for better security.
型材设计采用欧洲标准五金槽口，连接多个锁点，达到很好的防盗作用。
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Which has been resorting itself already, locking in lots of index points by rebalancing Apple down a notch or two.
FORBES: Apple To Fall Off Fiscal Cliff?
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