lower birth rate incense

We know that smoking during pregnancy results in lower birthrate incense. In other words because of smoking babies are small at birth. And that's the one thing we really know. There have been other things that've been implicated that there is increasing birth defects in smoking women."

帮忙看看第一句怎么翻译，尤其是这个incense
前一段就不用提供了，相关性不大
谢谢

确实不好翻译。
意思是怀孕期间吸烟导致低出生率
但是incense好像没这个意思。confused

incense 应该是 increase. 我们知道在怀孕期间吸烟会加速低生率的上升。

incense n.香（拜拜用的那些） v. 激怒 如果真的要翻的话，就是光是incense个这字搞到这巨子很confusing的

这个确实有点歧义，不过通过实际情况可以这样翻译。 现在的出生率略低于四十年前的出生率的四倍。