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Morphologically, there are several types.
从形态学来说，有好几种类型。
youdao
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These two kinds are morphologically similar and easy to be mixed up.
这两种薄煤层在形态上有相似之处，容易混淆。
youdao
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These two kinds are morphologically similar and easy to be mixed up.
这两种薄煤层在形态上有相似之处，容易混淆。
youdao