ridge-like fold 脊状褶皱 ; 梳状褶皱
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Flatten each leaf and fold lengthwise so that the underside of the leaf is folded inside and main leaf vein forms the top ridge of the fold.
纵向拼合每个叶和褶皱，叶底面内折叠和主叶脉形成顶部的褶皱脊。
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