他在揣摩着他们行为反常的原因。

He was feeling after a reason for their unusual conduct.

youdao

而在接下来的一个月，也就是1975年1月，当地就有数千个动物行为反常的事件发生。

During the following month, in January 1975, thousands of reports of unusual animal behavior were received from the general area.

youdao

多年来，这种反常的行为使科学家们感到困惑。

For years this anomalous behaviour has baffled scientists.

《柯林斯英汉双解大词典》