Most compact cameras and all SLRs have a focus-lock capability, activated by pushing the shutter release button down halfway.

大部分的紧凑型相机和所有的单反相机都有一个焦点锁定功能，通过把快门按下一半儿来实现。

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The action is replayed repeatedly as long as the shutter-release button is half-pressed.

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On the right, it houses a power button and a two-stage shutter release, along with a volume rocker on the left.

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