Do a deep knee bend, and it's very likely you'll hear popping sounds coming from your knee joints.

当我们蹲下又起来的时候，常常会听到膝盖关节处发出“咯咯”的响声；

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Do a deep knee bend, and it's very likely you'll hear popping sounds coming from your knee joints.

当我们蹲下又起来的时候，常常会听到膝盖关节处发出“咯咯”的响声；

youdao