21.   His film delivers plenty of shock value, but it leaves no trace.

22.   Hydrofluoric acid can severely damage the deep tissues of the body yet leave little trace of damage on the skin surface.

23.   In the tropics, dead animals are immediately consumed by ants, bees and other creatures, and leave no trace on that spot, he said.

24.   It is hard to eat a soup dumpling without leaving a trace on your shirt.

25.   Like water, he appears to have been virtually transparent to those who encountered him, and to have evaporated without leaving much trace.

26.   Local justice authorities say the existence of vigilante groups is difficult to detect because they leave few traces and witnesses refuse to talk out of fear of reprisals.

27.   No event this astonishing, this frustrating, this unsettling can move across the American landscape without leaving a trace.

28.   Olestra is a fake fat that tastes just like the real thing but, amazingly, passes through the body without leaving a trace of fat or calories.

29.   On becoming Vinlanders, they lived primitively, much as French trappers did centuries later, marrying Indian women and leaving few traces.

30.   Other observatories spotted the arrival of Fragment N as a small flash that subsided rapidly and left no trace.