sway;swing;rock;vacillate 两国关系是稳定的，但有点～。The relations between the two countries have been stable,but a little bit bumpy./机身～。The plane rocked./态度～ waver/～不定vacillation;wavering;swing back and forth;swing to and fro;chop and change/～不定的人waverer;wobbler/～舞waggle dance;rock and roll