更进一步来看，主要致病原因仍不明朗，它造成的结果是，很难制定一个统一标准来考察干涉方案的适宜性。
Furthermore, the ultimate cause of the disease remains obscure, which makes it hard to gauge the appropriateness of an intervention.
关于特殊的应用或应用种类的等级、处理和验收标准的适宜性，它没有作出建议。
It makes no recommendations regarding the suitability of any grade, treatment, or acceptance criteria for any particular application or class of applications.
通过分析发现，现行建筑制图标准中的图形符号绝大部分在大小和形状具有适宜性、区分性。
The most of the figure symbols of the current unified standard of architectural drawing are proper and there are distinctions between those.
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