Sound theory
声论───Sound theory
However, it is restricted in application owing to the lack of a sound theory about the calculation of force of the parabolic oblique arch bridge.───但对抛物线斜板拱桥的受力计算尚无成熟理论，使之应用受到限制。
conclusions of the two methods were same, and thus a sound theory basis is provided for further research on the reliability and maintainability of repairable system.───两种方法结论一致，为进一步研究可修系统可靠性、维修性提供重要理论依据。
For this reason, the need for an exit plan based on sound theory before a stock purchase cannot be overemphasized.───由于这个原因，在交易之前有一个建立在良好理论基础上的退出计划是说再多也不过分的。
The "forward" face guard theory and "backward" pharynx sound theory, developed from the Italian traditional Bel Canto, are the core threads that run through all ideas in various vocal music schools.