未改变的

These and other health changes are attributed to Splenda remaining unabsorbed in the gut.

这些问题和其他健康状况的改变是由于代糖仍有部分未吸收的遗留在肠道内。

Darwin expected species to change slowly, but not at the same rate – some organisms such as Lingula were unchanged since the earliest fossils.

达尔文认为物种变化是缓的，但不是以同样的速度变化--一些如海豆芽一样的物从最早的化石以来未发改变。