The volume of scheduled flights is straining the air traffic control system.定期航班的数量正让空中交通指挥系统不堪重负。Today we are overpopulated, straining the earth's resources.现在我们人口过多,致使地球资源使用过度。There is someone straining his ears a...
多发性硬化症发病机理研究进展.Experimental study on pathogenesis of syringomyelia associated with Arnold Chiari malformation.肌萎缩侧索硬化 症 累及部位包括上 、 下运动神经元以及皮质脊髓束.Amyotrophic lateral sclerosis ( ALS ) involves upper neuron , lower neuron a...