早期的墨水是利用灯黑 ( 一种碳的形式 ) 或各种颜色的汁液 、 萃取物和悬浮液制成.Early inks used lampBlack ( a form of carbon ) or coloured juices, extracts, or suspensions animalandsubstances....
He was constraining his mind not to wander from the task.他克制着不让思想在工作时开小差.The most constraining resource in all of these cases is venture capital.在所有这些情况下最受限制的资源便是投入资本.They both have a document data model, and that's...