21.   Still, some investors are clearly worried that U.S. stocks have risen too high, and in triggering that alarm, Greenspan may have accomplished his purpose.

22.   The alarm was triggered by marijuana use among teenagers, which has been rising since before Clinton moved into the White House.

23.   That means the clip can be attached to a purse so that the alarm will be triggered automatically if the purse is stolen.

24.   The device triggers an alarm, warning drivers that although the tire is not actually flat, it has lost air and needs to be replaced soon.

25.   The devices trigger an alarm when someone tries to leave a store without paying for merchandise.

26.   The foul air is most likely to trigger alarms in older detectors, which may react too quickly.

27.   The first time, thieves triggered the alarm, which is wired to the police department, and fled, said Dr. Brad Taylor.

28.   The homecoming parade may include high-tech medical devices that trigger alarms at a hint of trouble, while fatigued parents juggle bottles, diapers and medications.

29.   The plots, they said, would have triggered internal alarms and would have been documented at the time, not in a memo two years later.

30.   The small label triggers an alarm when the item is improperly removed from a store.