Further evidence for persistent internal rhythms appears when the usual external cycles are shifted—either experimentally or by rapid east-west travel overgreatdistances.
In particular, because of their low mass and their tendency to interact with one another overgreatdistances, they cannot be "pinned down" to any one location.
特别地，由于它们的质量很小而且有与远距离的离子进行相互作用的倾向，它们不会被固定在任何一个位置。
3
The same is true for locusts and other migratory pests that can fly overgreatdistances and threaten crops hundreds or thousands of kilometres away from their places of origin.