在排卵期、精子化期或自然退化期，性腺体积变小。
After ovulation, spermiation or natural degeneration, the volume of gonad was smaller in stage VI.
几百万年前，猛犸象从非洲大陆向北迁徙到欧亚大陆上，第四纪冰川期突然袭来，它们除非保持体温，否则只有死路一条，为此他们退化了尾巴和用来散热的大耳朵，而且进化出厚厚的皮毛。
A couple million years ago, mammoths migrated north from Africa to colonize Eurasia. Sometime around then a massive ice age kicked in—and it was stay warm or die.
青春期痴呆一种精神分裂症，通常始发于青春期，其特征为举止痴呆、傻笑、妄想、幻觉以及退化的举止。
A type of schizophrenia, usually starting at puberty, characterized by foolish mannerisms, senseless laughter, delusions, hallucinations, and regressive behavior.
青春期痴呆一种精神分裂症，通常始发于青春期，其特征为举止痴呆、傻笑、妄想、幻觉以及退化的举止。
A type of schizophrenia, usually starting at puberty, characterized by foolish mannerisms, senseless laughter, delusions, hallucinations, and regressive behavior.
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