hard sledding

bacterial Bristle chuttered conduction electron spin resonance coonrod electric propulsion thruster etherone fog juice free-induction decay health-care assistant impingement centrifugal separator monofractal multistage ammonia/water absorption refrigerating Oryza officinalis split keyboarding stereospermum sinicum hance stomatal mother cell surprisin' topcentric coordinate system ttm xanthine nucleotide