医生们一开始安全的移除了脑内的肿瘤，但在手术之后肿瘤又逐渐长了回来。
The tumor was benign, doctors safely removed it, and it has gradually been growing back since the surgery.
减肥手术变得越来越安全，复杂程度和死亡的可能性都在下降。
The surgery is also becoming safer; the rate of complications is down, and so are the number of deaths.
白内障手术的开展十分普遍并且基本上是一项安全的操作。
Cataract surgery is very common and is generally a safe procedure.
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