Teaching of mathematics should develop students' internal construction, external construction ability and the ability to construct thinking dialectically.

数学教学要培养学生外源建构、内源建构和辩证建构思维能力。

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The reasons: Cambodia’s recent rapid growth has been driven by robust activity in four sectors (garment, tourism, construction, and agriculture) – each vulnerable to external shocks.

原因是柬埔寨近期取得的快速增长主要一直受四大行业（服装、旅游、建筑和农业）的强劲增长推动，但每个行业都易受外部冲击的影响。

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Speed up document construction. Often the process of retrieving a document from somewhere external (database, filesystem, crawled from a Web site, etc.) is very time consuming.

在通常的情况下，文档的数据来源可能是外部(比如数据库，文件系统，蜘蛛从网站上的抓取等)，这些通常都比较耗时，尽量优化获取它们的性能。

youdao

At Stornoway, there was a 2.4% fall, mainly due to the completion of the school building programme, a project which used external construction workers flying between Stornoway and the mainland.

BBC: More passengers at Dundee as HIAL airports see growth

Property damage claims were analyzed over a two-year period (from January 2009 to December 2010) to ensure the findings would not be impacted by external influences such as weather or road construction.

FORBES: Cities With The Worst Drivers 2012

It enables the construction to function as a self-managing ecosystem with less need for external energy.

CNN: Green walls: the growing success of 'vegitecture'