On the other hand, heavy use of object composition can make designs harder to understand.
另一方面，大量用对象的组合可能会使设计很难被理解。
To make or become unusable through long or heavy use.
这些话不会因重复使用而变得陈旧。
Heavy oil processing is a very important way to make reasonable use of petroleum resource.
重油深度加工是合理利用石油资源的重要途径。
Heavy oil processing is a very important way to make reasonable use of petroleum resource.
重油深度加工是合理利用石油资源的重要途径。
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