然而，这种方法的将会导致数据库的执行和维护非常复杂，而且成本较高。

However, this solution makes the implementation and maintenance of the databases complex and costly.

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单一的水性聚氨酯分散体存在自增稠差、固含量低、耐水性差、机械强度不如丙烯酸树脂等缺点，而且成本较高。

There exist many disadvantages of the single WPU emulsion, such as poor self-thickening, low solid content, weak water resistance, lower mechanical strength compared to acrylic resin and high cost.

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这种方法导致了光学组件变得更大、更重而且趋于复杂化，光学制造成本较高。

This approach leads to large, heavy and complex optical assemblies and a higher manufacturing cost for specialized optics.

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