沉思: to contemplate, to ponder, contemplation, meditation...
轰炸: to bomb, to bombard...
痕迹: vestige, mark, trace...
密度: density, thickness...
待遇: treatment, pay, salary, status, rank...
顶尖: peak, apex, world best, number one, finest (competitors), top (figures in a certain field)...
火车: train...
工作量: workload, volume of work...
乘: to ride, to mount, to make use of, to avail oneself of, to take advantage of, to multiply (math.), Buddhist sect or creed...
新兴: (of markets, industries, infectious diseases etc) rising, emerging, in the ascendant...
