开车走的时候，我留意到两只松鼠互相追逐着，爬上了其中一棵山核桃树。
Pulling from the curb, I noticed two squirrels chasing each other up one of the pecan trees.
研究者为这两只松鼠猴注射了某种病毒，该病毒经处理携带了修正过缺陷的基因。
Researchers treated the monkeys by injecting them with a virus that had been modified to carry a corrective gene.
这些医生花了10年时间来训练这两只松鼠猴接受色视觉测试，这类测试是用来评估该疗法疗效的。
Doctors spent nearly 10 years training the monkeys to take colour vision tests, which were used to assess how well they responded to the treatment.
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