flutterboard

n.

（游泳）打水板，打腿练习板；

Flutter board
FLUTTER BOARD DERMATITIS
NZ On Screen - Costa Botes
NZ On Screen - Catching the Tide - Sam Hunt's Cook Strait
FOR THE RECORD: An Encyclopaedia of Historical Aspects of New Zealand Physical Education
NZ On Screen - NZ Book Month Collection
NZ On Screen - Murray Milne
Atrial fibrillation or flutter
Atrial fibrillation or flutter - National Library of Medicine - PubMed Health
Dofetilide in Patients with Congestive Heart Failure and Left Ventricular Dysfunction: Safety Aspects and Effect on Atrial Fibrillat...