a political movement (= a group trying to create change) that protests about violence against Black people and emphasizes that Black people's lives are of equal importance to other lives

The athletes knelt to show their support for Black Lives Matter. 运动员们跪下来表示他们对“黑人的命也是命”运动的支持。

Black Lives Matter protesters demonstrated outside the court building. 参加“黑人的命也是命”运动的抗议者在法院大楼外示威。