symmetrical fold
常见例句
- Fan-like cleavage means cleavages at axis faces occurring in the core of a fold, which spreads in fan like and shaped like branches of trees or straight with good symmetrical patterns.
扇状劈理是在褶曲核部发育的轴面劈理，呈扇形展布，为破劈理，劈理间距不等，呈树枝状或平直状，对称性较好。
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