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| left atrium (主要由肺静脉近端发育形成，略呈立方形，位于右心房的左后方，左、右心室的后上方。左心房突向前，形成左心耳。左心房接受左上、左下、右上、右下肺静脉，经左房室口通向左心室) | |||
| right atrium | |||
| left atrium | |||
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左 心房 : 3 phrases in 1 subject |
| Nursing | 3 |
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