资源学、环境学、生态学是同一层次的学科。
Natural resources science, environment science and ecology are the disciplines at same level.
同一个词的音节内部的声母、韵母和声调应属同一层次。
The initial, rhyme and tone in a syllable must belong to the same time level.
同一个词的音节内部的声母、韵母和声调应属同一层次。
The initial, rhyme and tone in a syllable must belong to the same time level.
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