由于在儿童患眼施行穿透性角膜移植风险很大，可能引起多种严重的并发症，这使得在儿童患者使用人工角膜显得更加必要。
PKP performed in children can be a high-risk procedure with the potential for serious complications, making the use of a keratoprosthesis more reasonable.
因此，如何开发出一套让工作人员能够更加方便地进行安全快捷的监视和操作控制的图形系统，显得尤为紧迫和必要。
Therefore, how to develop a set of graphics system which the staff can monitor more conveniently and safely, appear to be particularly urgent and necessary.
随着高耸结构被广泛应用于各个领域，对其进行结构风振控制则显得更加迫切和必要。
With the widespread use of high-rise structures, it is essential and necessary for them to make the wind-vibration control.
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