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Bone marrow transplantation began 20 years ago.是什么意思？

Bone marrow transplantation began 20 years ago.

骨髓移植开始于20年前。

相关词汇
bone marrow transplantation began years ago

bone

n. 骨头，尸骨，骨质物，有…样的骨头的；vt. 挑鱼刺，剔骨头，剔去…的骨；vi. 苦学，专心致志；

marrow

n. 骨髓，脊髓，滋养品，〈英〉食用葫芦；

transplantation

n. 移植，移植法，移居，移民；

began

v. 开始( begin的过去式 )，着手，创始，创办；

years

n. 年( year的名词复数 )，年纪，一年的期间，某年级的学生；

ago

adv. 以前，过去的，之前；
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