在实际工程中，靠人为摸索和经验积累来估计凸度，不仅效率低、成本高，而且误差大。
In practical process, the crown is designed by trial and accumulative experience, leading to low efficiency, high cost and big error.
在实际工程中，靠人为摸索和经验积累来估计凸度，不仅效率低、成本高，而且误差大。
In practical process, the crown is designed by trial and accumulative experience, leading to low efficiency, high cost and big error.
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