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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；
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
You will find the dog's tractability and friendliness.
你会发现狗既温顺又友好。
Her mother's voice in the corridor roused her from an angry trance.
她气得失魂落魄,是她妈妈在走廊里的声音唤醒了她.
His final act would be a single transcendent gesture on their behalf.
最后这一行动将是为他们着想而作出的一项不平凡的姿态.
Therefore, education is essentially transcendent.
所以，教育本质上具有超越性。
Just a few more days, till we totter in the road!
再过几天, 我们将蹒跚着走上大路!
The critics's reaction to the film was rather tepid.
评论家对那部影片的反映不太热烈.
Tenacity is the bridge to success.
坚韧是通向成功的桥.
a pair of tongs
一把夹剪
It was a lie, tout court.
那只不过是谎言。
Reduced tackiness and stickiness during and after application.
在使用中或使用后能减少粘性。
He has recently been refused tenure.
他最近被拒绝授予终身职位.
He is regarded as one of the great transcendental idealists .
他被认为是一位伟大的先验的观念论者。
42 As the touchstone tries gold, so gold tries man.
42试金石试金, 黄金试人.
I am their lucky talisman; my business has never been so good.
我是他们命运保护神, 我的生意从来也没这么好过.