The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;
精原
期，精巢小，透明乳白色，生精小管内的生
以精原为
；
The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;
精原期，精巢小，透明乳白色，生精小管内的生以精原为；
The testis at spermatid phase develops continually, and is deep in color, and the spermatogenetic cells in seminiferous tubule are primarily composed of spermatids.
精期，精巢
续增大，颜色加深，生精小管内的生以精为；
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