In late Qing dynasty, impacting the wave of 'West Learning', traditional children education stepped into the threshold of modern education.
清末时，在“西学东渐”浪潮的冲击下，传统儿童教育踏入近代的门槛。
2
Stress. wave propagation in stepped shafts under impact by dynamic photoelasticity was studied.
本文用动光弹方法研究了受冲击载荷的阶梯轴中的应力波的传播。
3
In winter, the air wave with large snowflakes, not for a moment, then on the ground covered with white snow, people stepped in the thick soft snow, really comfortable ah!