The rule of thumb used by zoologists is that a transmitter worn by a flying animal should weigh no more than a twentieth of the weight of the individual wearing it.
按照动物学家基本计算方法，飞行动物佩带的发射器重量应当低于其本身体重的1/20。
2
Rossy had never flown for longer than ten minutes and had to calibrate his equipment and weight to perfection since even the addition of a few hundred grammes would have affected his flying ability.