在小鼠中，这些基因的突变可导致小鼠额外足趾的生长，所以有理由认为熊猫第二拇指生长的原因也是基因突变。
In mice, mutations in these genes are known to encourage extra digits to grow, so it is not unreasonable to suspect that they are also the cause of this in pandas.
拇指的活动是帮助大熊猫去寻找竹子并吃掉它。
The thumb's action is helping the giant panda to hold bamboo while eating.
熊猫真正的大拇指被认为另有他用。
熊猫的大拇指是一个经典的例子，它用来抓取竹子。
The classic example is the panda's thumb, which it USES to grasp bamboo.
熊猫的大拇指是一个经典的例子，它用来抓取竹子。
The classic example is the panda's thumb, which it USES to grasp bamboo.
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