The Food and Drug Administration has not approved Avastin for use in the eye, and using it rather than the alternative, Lucentis, might carry an additional, although slight, safety risk.
美国食品和药品管理局还没有批准阿瓦斯汀用于眼部治疗，使用它来代替雷珠单抗可能会产生额外的安全风险，尽管这一风险也许很轻微。
The implications of the slight genetic differences in this strain are also not known.
这个毒株内少量遗传差异的含义也并不清楚。
In much of eastern Europe it started dropping in the 1980s in response to the upheaval in the region, and despite a subsequent slight recovery it has still not regained the level of the 1960s.
20世纪八十年代，在东欧许多地区，这一数字因该地区的剧变开始下降，尽管随后又略有回升，但仍未恢复20世纪60年代的水平。
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