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英语翻译1.Studies show that the virus is usually passed to an in

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英语翻译
1.Studies show that the virus is usually passed to an infant close to or during delivery,rather than moving across the placenta during pregnancy.Recently infected mothers can transmit the virus to their children via breast milk.The United States Congress approved guidelines recommending that health care workers who perform invasive procedures be tested for the AIDS virus but the testing and disclosure of results would be voluntary;no restrictions would be placed on those who tested positive.
2.The stratospheric vortex broke up later in the year.
英语翻译1.Studies show that the virus is usually passed to an in
1.研究表明,对比起在怀孕时通过胎盘转移的方式,病毒更通常的是通过紧密接触或在分娩过程中传给婴幼儿.最近,被传染的母亲可以通过母乳喂养将病毒传给小孩.美国国会通过一项指导方针,建议那些参与外科手术的医疗人员要参加关于AIDS病毒的测试,但是否参加测试以及测试结果是否公布都是自愿的.而且并没有对那些积极参加测试的人并没有限制.
2.平流层的中心在年底被破坏了.