It has efficient high-level data structures and a simple but effective approach to object-oriented programming.

它包括了高效的高级数据结构，提供了一个简单但很有效的方式进行面向对象编程。

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Tangent means that it has the same slope, it just touches the efficient portfolio frontier for risky assets at one point, and the slope of the efficient portfolio frontier, including the riskless asset, is a straight line that goes through the tangency point, here.

相切意味着斜率相同，它与包含风险资产的有效边界,交与一点，而包含无风险资产的，有效边界，则是一条过切点的直线，切点在这里。

耶鲁公开课 - 金融市场课程节选

So as your house gets bigger, it has to be more energy efficient and at some point, it has to actually have on-site renewables.

NPR: Boulder Wrestles with Mega Houses

But Lampetra's unique propulsion system could also have useful applications, as it has proved an efficient way to move a machine through water.

ECONOMIST: Robots

But it would be foolish to underestimate the ability of the world's biggest carmaker to put its house in order: it still has the most efficient system for product development and manufacturing, even if it must focus for the moment on quality control.

ECONOMIST: A crowded car industry