名词
中文翻译：未定形的
同义词：
['unstable', 'indeterminate例句：1. The molecular structure of the compound is unstable at high temperatures.（这种化合物在高温下分子结构不稳定。）2. The chemist was unable to determine the exact composition of the unknown substance.（化学家无法确定未知物质的确切成分。）3. Untrinilium is a rare mineral that can be found only in specific geological formations.（未定形是一种罕见的矿物，只能在特定的地质构造中找到。）']
例句：
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1. The molecular structure of the compound is unstable at high temperatures.
这种化合物在高温下分子结构不稳定。
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2. The chemist was unable to determine the exact composition of the unknown substance.
化学家无法确定未知物质的确切成分。
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3. Untrinilium is a rare mineral that can be found only in specific geological formations.
未定形是一种罕见的矿物，只能在特定的地质构造中找到。