发生在缩微文献上的油渍现象是胶片在长期的保存过程中较为普遍的衰变现象。
The grease phenomenon of microfilm documents is common decay phenomenon in the process of the long-term preservation.
在长期的有机化学教学过程中，我们对有机化学的教学方法进行了探索，形成了较为完整的教学思路。
During the long course of organic chemistry teaching, we form the perfect teaching methods by exploring the teaching method of organic chemistry.
虽然统计学的历史方法已经长期用于生产上，但是统计过程控制成为一种较为普遍的现象，在许多情况下，成为一种较为普遍的要求，却是近几年的事。
Even though the historical measures of statistics have been long utilized in the manufacturing sector, it is not only until recently that SPC became more common place and in many instances, required.
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