名词
中文翻译：变质等级
同义词：
['变质程度，变质级别例句：1. The metamorphic grade of the rock is a critical factor in determining its strength.（岩石的变质等级是决定其强度的关键因素。）2. The metamorphic grade of the soil is an important indicator of its fertility.（土壤的变质等级是衡量其肥力的重要指标。）']
例句：
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1. The metamorphic grade of the rock is a critical factor in determining its strength.
岩石的变质等级是决定其强度的关键因素。
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2. The metamorphic grade of the soil is an important indicator of its fertility.
土壤的变质等级是衡量其肥力的重要指标。
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3.The metamorphic grade of the rocks has been studied extensively to understand their evolution.
对岩石的变质等级进行了广泛的研究，以了解其演化过程。