固体电解质是定氧测头的核心材料。

Solid electrolyte is the most important part for oxygen probe.

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在更具弹性的核心材料立面元素也提供必要的弹性生存地震。

Facade elements over more resilient core materials also provide the necessary flex to survive an earthquake.

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其核心材料主要包括发光材料，电子传输材料和空穴传输材料。

Its key materials mainly include emitter materials, electron-transporting materials and hole-transporting materials.

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This material will be necessary to do the listening exercises for the course, which is sort of the backbone of the course.

做听力练习时我们必须使用这些材料,听力训练是课程的核心内容

耶鲁公开课 - 聆听音乐课程节选