但是相对于钢模，其强度硬度较低、耐蚀耐磨性差，限制了应用。
However its intensity and hardness was low, wear-resisting and anticorrosion is poor, which is opposite in the steel, the application has been limited.
这个框架限制了应用程序能使用的API，对应用进行了更多的控制。
The framework restricts the API available to applications, giving more control over what those applications do.
虽然App Engine限制了应用程序可用的功能，但是它支持有用的Web服务的构造。
Although app Engine limits the functionality available to your application, it supports the construction of useful Web services.
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