求英语好的同仁，帮忙看看

　　求英语好的同仁，帮忙看看。The results are plotted on a linear y-axis rather than the conventional log axis that is typical for radiation (ionizing and UV) survival curves. If the data are transformed to a log-axis, one has a linear response (no shoulder). However, there is an extrapolation to less than unity (~0.80), indicating that something unusual is happening.

加粗部分是什么意思，半天没看明白。前面的意思理解，就是换成对数。

特别是 unity (~0.80),在这是什么意思？

[ Last edited by wsw1983457 on 2013-5-24 at 15:56 ]
===有问必答===
However, there is an extrapolation to less than unity (~0.80), indicating that something unusual is happening.
但是，你的曲线外推到了小于1 (~0.80)的地方，这与常识不符。