如果癌症已进入晚期，就可能需要化疗，这可能对未受影响的睾丸产生巨大影响。

If the cancer is at a more advanced stage, it will probably require chemotherapy, and this can have a dramatic effect on the unaffected testis.

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地球上很少有未受影响的地区。

There were few areas of the planet that were unaffected.

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家畜流行病和相关的人类流行病也有可能传播到之前未受影响的地区。

There is also a potential for epizootics and associated human epidemics to spread to areas that were previously unaffected.

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