Mirror lock-up (MLU) is a feature available in some SLR cameras which aims to minimize camera shake induced by mirror-slap (which produces the characteristic snapping sound of SLR cameras).

有些单反相机具有反光镜锁定(MLU)功能，可以减小镜面翻转造成的相机抖动(这也是单反相机经典“喀嚓声”的来源)。

youdao

He was about to lock the door when he heard a strange sound.

他正要锁门，这时听见了一个奇怪的声音。

youdao

Your situation does not sound like a gimbal lock.

你的情况听起来不像一个万向节锁。

youdao

"So I did do something about it go home and lock myself in my garage, in my recording studio, and not going to come out until I sound so different that I make my mother happy and she knows me from anybody else.

VOA: standard.2009.08.14

The southern hemisphere teams seem to have lost their usual dominance in the pack and I would say that the England combination of Johnson and Kay at lock forward would be a sound choice - Johnson is a fantastic leader and Kay has really emerged over the past few months.

BBC: Who makes the World XV?