今天人们对化学药剂和癌症的了解已比20年前增加了很多。可是，由于对致癌物的危险界限仍搞不清楚，这就妨碍了作出决定。
Much more is known about chemicals and cancer today than just 20 years ago, yet uncertainty about the risk of borderline carcinogens continues to hamper decisions.
但是，在决定关闭机场时并未考虑何为危险、隐性伤害和安全间的界限以及这三种级别如何随火山灰微粒类型与数量的变化而改变的因素。
But where the boundaries between danger, potential damage and safety lie, and how they vary with the type and number of ash particles, was not taken into account in the decisions to close airspace.
柏林墙的倒塌带来了新的希望，但是这种紧密接触也带来了新的危险—这些危险不受国界限制或大洋阻隔。
The fall of the Berlin Wall brought new hope. But that very closeness has given rise to new dangers-dangers that cannot be contained within the borders of a country or by the distance of an ocean.
因为，当普通人自发、自觉地与艾滋病人划清界限、将其边缘化时，艾滋病易感人群就陷入被大众社会抛弃的危险境地。
Because, when ordinary people spontaneously, consciously people with AIDS to draw boundaries to their marginalization, the AIDS on vulnerable groups into society abandoned by the public at risk.
本目录是以化学品毒性指标作为判定界限而收录，不改变现行有关危险化学品的分类。
The Catalogue was prepared with toxicity indexes of the chemicals as the judging boundary. It does not change the existing classification of hazardous chemicals.
一些实施例中，光源202产生的光数据信号的光功率可能超过危险程度1M界限。
In some embodiments, the optical power of the optical data signals generated by the optical source 202 can exceed Hazard Level 1 m limits.
一些实施例中，光源202产生的光数据信号的光功率可能超过危险程度1M界限。
In some embodiments, the optical power of the optical data signals generated by the optical source 202 can exceed Hazard Level 1 m limits.
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