It is the outer part of the joint where the arm bends.
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【简答题】根据句意用冠词a、an、the或 / 填空 1.It's ____ my English book. 2.Lucy is from ____USA . 3.It's ____ English book. 4.—What's this? —It's ____ map. 5.It is ____ “L”. 6.—What's this in English? —It's ____ orange. ...