在多晶体材料中晶粒平均尺寸的增加，对大多数材料来说，这需要在一定温度下进行热处理。

The increase in average grain size of a polycrystalline material, for most materials, an elevated-temperature heat treatment is necessary.

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多晶体材料中晶粒尺寸的增大，对大多数材料来说，晶粒长大只在升高温度加热的时候发生。

The increase in average grain size of a polycrystalline material; for most materials, an elevated-temperature heat treatment is necessary.

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所谓的胃灼热、胃酸逆流或是胃食道逆流是一种慢性的胃病，罹病的人不仅痛苦，治疗更是所费不赀，标准治疗程序 (包括非处方药) 与手术是个商机庞大的市场；庆幸的是坊间还有很多简单有效的传统替代疗法，如苹果醋、肉桂及生姜等材料，对大多数的人来说都非常容易取得。

Standard interventions of medication and surgery also include over the counter remedies for which there is a huge market. Fortunately, there are many effective alternative and traditional solutions.

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For many of you, you're going to find it dense material.

对大多数人，你将会有很多繁重的读书材料。

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