求助一道Magoosh三空题

破烂超UID：3570480

竹溪婉笛 发表于 2014-10-31 20:56
我也是这道题做错了，感觉还是不太明白，能不能把完整的句子翻译一下？

Advocates of anti-smoking campaigns are reluctant to acknowledge  the fact that the number of smokers per capita has been steadily decreasing since the 1970s, perhaps aware that, lest this trend reverse itself, their message, which is predicated on dire predictions, is likely to be more efficacious than one rooted in reality.
戒烟公益团体不愿意承认目前的吸烟人数已经从1970s开始就稳步下降，因为这个团体知道，要避免这个下降趋势被逆转的话，他们这种针对严重后果的声明（如吸烟人数增加，或更坏的后果）必须要比社会现实的现状（即吸烟人数变少）更加令人觉得灵验（efficacious），这样才能震慑住很多人，让他们戒绝吸烟。