To restore the original occurrence condition of a primary sedimentary structure is a routine work for palaeocurrent analysis.
恢复原生沉积构造的原始产状要素，是古水流分析中的一项重要基础工作。
The occurrence condition of southern Zhejiang severe convective event on 13 March 1987 is analyzed.
本文对1987年3月13日浙南地区强对流过程发生的条件作了分析。
Through the analysis of Guizhou coal resources' occurrence status, the paper points out the characteristics of the occurrence condition of Guizhou coal resources and the mining technical requirement.
通过对贵州省煤炭资源赋存状况的分析，找出煤炭资源赋存条件和开采技术条件的特殊性。
The occurrence condition for dragging behavior could be obtained according to the relationship between slow driving time and waiting time.
通过低匀速行驶时间与停车时间之间的关系，可以得到车辆发生拖延行为的条件。
The occurrence condition for dragging behavior could be obtained according to the relationship between slow driving time and waiting time.
通过低匀速行驶时间与停车时间之间的关系，可以得到车辆发生拖延行为的条件。
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