v.波动，起伏，上上下下
Merriam-Webster Online Dictionary
fluctuate (verb)intransitive verb
1.
to shift back and forth uncertainly
2.
transitive verb
to ebb and flow in waves to cause to fluctuate swing
Merriam-Webster Online Thesaurus
fluctuate (verb)to pass from one form, state, or level to another
SYNONYMS:
fluctuate, mutate, shift, snap, varyRELATED WORDS:
metamorphose, morph, transmute; better, improve; deteriorate, worsen; turn around; seesaw, teeter, vacillate, waver