模型还包含一组可以在创建一些复合要素时有用的可复用模型要素，至少使用这些要素要比手动创建更简单。
The model also includes a set of reusable model elements that are useful in creating some of the compound elements; at least using these is simpler than creating them by hand.
模型还包含一组可以在创建一些复合要素时有用的可复用模型要素，至少使用这些要素要比手动创建更简单。
The model also includes a set of reusable model elements that are useful in creating some of the compound elements; at least using these is simpler than creating them by hand.
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