Quality assurance is not only a promise after quality problems have appeared, but also a mechanism used to present quality defects.
质量保证并不仅是质量出现问题之后的承诺，而是预防质量缺陷的一种机制。
Some problems such as concrete cracking, bigger deflection of span and abandoned beams caused by construction quality have appeared in the completed prestressed concrete voided slab Bridges.
在已建设的众多预应力混凝土空心板桥梁中，存在出现混凝土裂缝、跨中挠度过大及因施工质量问题而造成废梁等问题。
Although some voice tools have appeared, there are still some significant technique problems unresolved, especially the mediocre voice quality.
尽管已经出现了一些语音工具，但仍还有一些重要问题有待解决，尤其是音质普遍不高。
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