1. (of the testis) remaining in the abdomen instead of descending into the scrotum. 
   （睾丸）仍在腹部而没有降到阴囊的。
2. malignant tumor of the testis; usually occurring in older men. 
   睾丸上的恶性肿瘤；通常发生在年龄较大的人。
3. Surgical removal of the serous membrane covering the testis and epididymus. 
   覆盖在睾丸和附睾丸的浆膜的外科移植手术
4. An organ in animals that produces gametes, especially a testis or an ovary. 
   性腺动物身上的一种器官，能产生配子，特别是指睾丸或卵巢
5. theory of centers of origin of crops 
   作物起源中心学说

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