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。

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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。

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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!

冬天，空中飘舞着鹅毛大雪，不一会儿，地上便铺满了洁白的雪，人们踩在这厚厚的软绵绵的雪上，真舒服啊！

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Another part of the problem: Many traders, including a number of high frequency trading firms that normally make up 60% of daily trading volume, stepped aside and stopped buying, draining liquidity from the system when it was trying to deal with a tidal wave of sell orders.

FORBES: SEC Sets 6-Month Test of Stock Circuit Breakers