本文对河北省北部的塞罕坝机械林场和御道口牧场的森林鼠害防治技术进行了初步研究，包括杀鼠烟剂的筛选和中药提取物的筛选。
In this paper, the preliminary study on prevention and control technique of forest rat harm in Saihanba Mechanised Tree farm and Yudaokou Ranch of northern of Hebei was made.
金花鼠数量显著地增加，是因为森林里连续两年丰硕的橡子收成。
The chipmunk population increased strikingly due to two successive years of abundant acorn crops in the forest.
生物学家：在一片食肉动物不受控制的灌木丛里，每公顷的新西兰森林就有2到6只船鼠和3到13只负鼠。
BIOLOGIST: In a bush that doesn't have predator control, every hectare of indigenous forests within New Zealand has between 2 and 6 ship rats and about 3 to 13 possums.
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