“膝”造句

呼气，膝部放松向胸部靠拢。
Breathe out and ease your knees in toward your chest.

他的一条腿不得不从膝部以上截断。
He had to have one leg amputated above the knee.

麦卡纳利双膝发软，瘫倒在地板上。
Mcanally's knees buckled and he crumpled down onto the floor.

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