完成20组练习后，再用非主力脚做同样的练习。
Make 20 complete passes and then do the same with your weaker foot.
有利的沉积相带、运移输导条件及鼻状隆起构造共同控制了延长组主力油层的分布。
The sedimentary face zone, reservoir physical properties, nose fold background and the condition of hydrocarbon migration carrier are the main factors of control hydrocarbon accumulation.
其中延长组的长2油层组是本地区的主力产油层系。
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