As they were introduced, George reached his hand out to the Japanese student.
out 在这里做宾补还是状语,我觉得是状语 但是好像宾补也说得通, his hand is out.
reach one's hand out =reach out one's hand 伸出某人的手
He reached out his hand to touch her.
他伸出手去摸她.
She reached out a hand and touched his forehead.
她伸出手抚摸他的前额。
备注:reach不及物动词意思等于reach one's hand
reach+介词短语=reach one's hand+介词短语,介词短语描述宾语one's hand在动作reach作用下移动/运动方向。
 Judy reached into her handbag and handed me a small, printed leaflet. 
 朱迪把手伸进手提袋中,递给我一张小小的印刷传单。
I reached across the table and squeezed his hand.
我把手伸到桌子的另一边,捏住他的手。
He reached up for an overhanging branch.
他伸手去够悬在头顶上的树枝。
 
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