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然而,这种方法在肿块较大时可能不是那么有效,并且其长期效果至今未知。
This procedure may not be effective on large prostates. Its long-term effectiveness is unknown.
目前没有研究显示为什么大量阅读会导致这一结果,但是由于长时间聚焦近处的物体需要眼部肌肉持续收缩以保证视网膜保持需要的形状,因此这种眼肌的持续收缩状态可能会使眼球受到拉伸,长期如此,其原有形状可能会被永久地改变,从而导致近视产生。
But focusing on close objects involves contraction of muscles controlling the shape of the eye's lens. And one possibility is that "this constant contraction may stretch the eyeball.
尽管这种病毒是在1947年发现的,但其长期后果并没有得到过研究。
Although the virus was discovered in 1947, there has been no research into its long-term consequences.
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