原则2：了解回归测试套件中现有测试材料的质量和覆盖。

Principle 2: Understand the quality and coverage of the test material in the regression test suite.

youdao

这是个地标，材料的质量和清晰的设计思路都说明了这一点。

It is a landmark, recognisable by a sober design and the quality of his materiality.

youdao

这减少了设备的厚度和电压损耗，从而降低材料的质量要求和探测器的材料成本。

This decreases the device thickness and depletion voltage and consequently reduces material quality requirements and cost of the detector material.

youdao

So, if you could make automobiles with a high magnesium content, you would reduce the mass, reduce the energy required, and thereby reduce the environmental impact.

所以，如果你能用含镁量,很高的材料来制造手机，你就能减轻手机的质量，减少制造所需能量，因此减轻了对环境的破坏。

麻省理工公开课 - 固态化学导论课程节选