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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
She was sitting on the rocks in the torrid sun.
她头顶灼热的骄阳坐在岩石上.
The plants are as dry as tinder after this long drought.
植物经过长期干旱之后干枯得如同火绒一般.
He has a rather tenuous grasp of reality.
他对现实认识很肤浅.
The formation causes adhesion and the factors which impressed the tackiness of stocks were introduced.
对其生成原因、影响因素等作了介绍.
I didn't want to be low man on the totem pole for ever.
我不想永远当小人物。
Net Weight: the gross weight less tare.
净重: 总重扣除皮重后的重量.
Tins took some temerity, but it was fruitless.
这件事做得有点莽撞, 但结果还是无用.
When I have a talon with a keen edge.
当我有了一对尖锐的利爪.
She was jealous, humiliated, and emotionally at the end of her tether.
她既忌妒又感到屈辱，感情上已经到了崩溃的边缘。
If you enjoy acting in plays , join your school's thespian club.
如果你喜欢戏剧表演，就加入你学校的戏剧社团。
If they can't clear it up, there'll be another tiff.
追算不清, 可能赔上小吵一次.
Do you attend operas , or do you read tawdry novels ?
你会参观歌剧表演，还是阅读通俗小说？
Pay attention to not missing any word when you transcribe the document.
在抄写这份文件时,注意不要漏掉任何字.
Twist the tourniquet tighter.
把止血带扎紧点.