black aiming mark黑心环
jet black measuring mark黑测标
black k mark-line墨斗线
Blue-black mark蓝黑点
pipe black mark水管黑印
plating black mark电渡发黑
black mark-line墨斗线
Black Mark Production出版者
N-COUNT（可数名词） A black mark against someone is something bad that they have done or a bad quality that they have that affects the way people think about them. 污点; 劣迹
There was one black mark against him.
有一个污点对他不利。