单词spiny-rat
网络: 棘鼠；日本的刺鼠
There is already a precedent for this in nature, in the form of a Japanese spiny rat which has survived the loss of its Y chromosome.
在自然界，这种新型染色体已有先例。在一种日本田鼠身上，即使没有了Y染色体，它们仍然能够繁衍生存。