1. The testis at spermatogonium phase is small and transparent, and the spermatogenetic cells in seminiferous tubule primarily consist of spermatogonia;
   精原细胞期，精巢小，透明乳白色，生精小管内的生殖细胞以精原细胞为主；
2. The testis at spermatid phase develops continually, and is deep in color, and the spermatogenetic cells in seminiferous tubule are primarily composed of spermatids.
   精细胞期，精巢体积继续增大，颜色加深，生精小管内的生殖细胞以精细胞为主；

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