微扰

微擾
wēirǎo
  1. infinitesimal disturbance
  2. perturbation (physics)

CEDICT

physics

Entry Composition

1 微 wēi
  1. tiny
  2. miniature
  3. slightly
  4. profound
  5. abtruse
  6. to decline
  7. one millionth part of
  8. micro-
  9. Taiwan pr. wéi
2 扰 rǎo to disturb