But the cementing operation is very difficult because of the complicated formation pressure system.
而调整井具有地层压力系统复杂的特点，给固井施工带来很大难度。
The formation of the vocal music skills is a very complicated procedure.
声乐技能技巧的形成是一个非常复杂的过程。
The gear forging formation is a complicated and large plastic deforming process.
齿轮锻造成形是一个复杂的塑性大变形过程。
The gear forging formation is a complicated and large plastic deforming process.
齿轮锻造成形是一个复杂的塑性大变形过程。
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