Please explain " a latch mechanism."
As they stalk their dinner, the trap-jaws hold their mandibles wide apart, often cocked open at 180 degrees or more by a latch mechanism.
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Answers · 2
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A "latch mechanism" is a locking device. It can be manmade or natural. In the case of this animal, there is something that locks the jaw open so that they don't have to make the effort to open the mouth when they catch the prey.
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In this context, I think it is some kind of biological feature that locks the jaw bone in place. "Latch" here means "to lock in place", like a latch on a door （门闩）.
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