I thought it was a field rat. I thought it had rabies.

我当时以为这是一只大老鼠。

youdao

And using the powder trace method to determine the field rat density and calculate the deratization effect.

用粉迹法测定现场鼠密度，计算校正灭鼠率。

youdao

Objective To understand the field rat repelling effect with the ultrasonic rat repellent and provide scientific data for rat prevention in special environments.

目的了解超声波驱鼠器现场驱鼠效果，为特殊环境防鼠提供科学依据。

youdao

Biocides are the name given for pesticides used outside the field of agriculture, such as rat poison or treating furniture with fungicides.

BBC: MEPs warning over rat population increase