Most information was collected by direct observation of the animals' behaviour.
大部分信息都是通过直接观察动物的行为收集到的`。
This product has not been tested on animals.
这种产品尚未在动物身上试验。
His research work was attacked by animal rights activists.
他的研究受到了动物权益维护者的抨击。
I can't stand people who are cruel to animals.
我无法容忍虐待动物的人。
The time has come for action if these beautiful animals are to survive.
若要使这些美丽的动物能生存下去，现在就要行动起来。