There is a hole in the thumb of his mitten.
手套姆
上有个洞。
There is a hole in the thumb of his mitten.
手套姆上有个洞。
Opposition in an important movement of thumb, for thumb opposes other fingers in many types of prehension.
摘要对向动作是大姆一个重要动作，它帮助大姆完成多数握执动作。
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正。
