quality of matrix structure的用法和样例：
例句
- The rock quality evaluation can be taken as a pattern recognition or classification problem.
岩体质量评价问题可以认为是一个模式识别或分类问题。 - For this reason, we made a analysis of the stress to the backfilling, pointed out the measures ensured in imporving the quality and intensity of the backfilling.
为此，对充填体进行受力分析，根据影响充填体的稳定性因素，提出了保证充填体质量及提高充填体强度的措施。
