先问你朋友，那家伙属于哪种FLUTTER？

UK: [/712;fl652;t601;(r)/]
1.flutter

2.to move lightly and quickly; to make sth move in this way （使）飘动，挥动，颤动

3.when a bird or an insect flutters its wings, or its wings flutter, the wings move lightly and quickly up and down （鸟或昆虫）拍（翅），振（翅），鼓（翼）

4.of a bird or an insect 鸟或昆虫 to fly somewhere moving the wings quickly and lightly 飞来飞去；翩翩飞舞

5.of your heart, etc. 心脏等 to beat very quickly and not regularly 怦怦乱跳；扑腾

6.a quick, light movement 振动；飘动；挥动；颤动

7.a small bet 小赌注

8.a state of nervous or confused excitement 紧张兴奋；慌乱

9.a very fast, unsteady heartbeat （心脏的）怦怦乱跳，扑腾