When they have these ACL tear, they're in a lot of discomfort and then the knee is just not stable.
当他们有前交叉韧带撕裂时，他们会很不舒服，膝盖也不稳定。
ACL tear
原声例句
国家地理科普（视频版）
梦幻橄榄球手
And you do have Mike Williams out for the year, ACL tear.
迈克·威廉姆斯确实因前十字韧带撕裂而缺席了今年的比赛。
英语百科
Anterior cruciate ligament injury
The anterior cruciate ligament (ACL) is an important internal stabilizer of the knee joint, restraining hyperextension. Anterior cruciate ligament injury occurs when the ligament's biomechanical limits are exceeded (over-stretched), often with a hyperextension mechanism.
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