Can sand flow upward in the hour glass?
时间的沙漏能倒流吗？
Wind sand flow is the main calamity to the railway.
风沙流是危害乌吉铁路的主要形式；
Can tomorrow's sand flow through the glass before today's?
想着明天的种种，今天的时光也白白流逝了。
The flow of sand in the hourglass like the never-discontinuous memories.
沙漏里流动的细沙，似是不肯间断的回忆。
What is worse, sand particles may even flow back into the formation to cause damage.
更为严重的是，井底砂粒可能随冲砂液重新返入油层，并对油层造成伤害。
This article introduced the structure, working mechanism and application of jet flow sand washer.
本文介绍主动脉内气囊反搏和体外反搏装置的原理和临床应用。
Air flow ahead of the gust front rolls up dry sand...
它是阵风锋面前沿反向上升气流卷起干燥地表尘沙而形成的。
Air flow ahead of the gust front rolls up dry sand on gro...
它是阵风锋面前沿反向上升气流卷起干燥地表尘沙而形成的。
Air flow ahead of the gust front rolls up dry sand on gro...
它是阵风锋面前沿反向上升气流卷起干燥地表尘沙而形成的。
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