For instance, in the past regulations demanded that transmitters should not weigh more than 5 % of the animal's body weight, and today this has been reduced to 3 % to prevent the devices being too great a burden and obstructing the animals 'movements.
例如過去規定發報器只能佔動物體重的五％，今天已修正為三％，以免負擔太重，影響行動。