The vulnerable period of another brain transplant would be doubly dangerous for a man whose power so many ruthless subordinates coveted.

Normally, the hot, dry weather would be driving soybean prices up because the bulk of the crop is now in its most vulnerable period.

The vulnerable period in the study lasted at least through the second week of withdrawal, much longer than had been believed.

But as it happens, Leela is passing through a vulnerable period.

Many species molt in a small, silken igloo that protects them from enemies during this vulnerable period.

The board presumed its suggestion would, however, diminish the chance of an explosion at a seemingly vulnerable period, right after takeoff.

The rise in youth homelessness is a testimony to the need for consistent support during this vulnerable period.

This is the most vulnerable period for any film because it's the time when your project is most likely to be put into turnaround.

During that vulnerable period an aircraft fired a missile.

What this means is that you should be particularly on your guard against manipulators during these vulnerable periods.