To generate a high-level class diagram, you need to create a blank model first.

为了得到一个高层的类图，您必须首先建立一个空白模型。

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In short, when designing style sheets for data documents, consider using the pull model first.

简而言之，当设计数据文档的样式表时，首先考虑使用拉模型。

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You need to review that list before attempting the export, and resolve any issues with the model first.

您在尝试导出时，必须检查一下清单，然后首先使用该模型解决问题。

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A model fort is the only structure in the park built in the exact place as the first building.

VOA: special.2009.08.17

Scholars have proposed three possible models to explain the formation of Israel. The first is an immigration model.

学者们提出了三种可能的模型,来解释以色列的形成，第一种是移民模式。

耶鲁公开课 - 旧约导论课程节选

Here,the first level: do we focus on weaknesses, which is the disease model,say let's get rid of weaknesses?

第一个层次：,我们是否重视缺点，也就是疾病模型所说的我们要摆脱的缺点？

哈佛公开课 - 幸福课课程节选

Many publications are following the a business model first developed by the Huffington Post, where contributors, self-edit and self post.

FORBES: Anil Dash to Tech Press: 'Know Your Stuff!'

They do not know when this unlockable phone will come out, but you can be sure the release has been timed (read: delayed) to make sure that everyone has a chance to buy a locked model first in order to protect the carriers.

FORBES: Wireless Carrier Lock-In, iPhone 5 Edition

This second iPhone model corrects some of the first model's main weaknesses, wiping out some advantages Sprint hoped the Instinct would have.

WSJ: Instinct Doesn't Ring True as iPhone Clone