环空管道后台阶突扩流动是空气正循环钻井过程中十分重要的关键部分，直接决定了钻探岩屑是否能够顺利上返地面。
The flow over a backward facing step of an annular tube is a very important part of air drilling, determining the detritus going back to the ground successfully.
吐哈油田地层压力较低、储层物性较差，且要进行上返试油的井采用常规测试射孔联作技术已不能满足生产需要。
Formation of Tuha oilfield belongs to low pressure and bad reservoir property which makes conventional combing tech of testing and perforation not being suit for need of production of oil well.
由于日光返辉区(sunglint)的关系图像形成鲜明对比，此区域的水面将太阳光直接反射至ISS上观测的宇航员处。
The stark contrast is due to sunglint, in which the Sun is reflected off water surfaces back towards the astronaut observer on board the ISS.
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