The book was called Henrietta Was Five Years Old. It was a story about a mouse family. But the story changed altogether when Brother Jules found those holes.
岁了》，讲的是一家老鼠的故事。但是，当朱勒哥哥发现这些洞的时候，整个故事就变了！
2
Methods Visualization, investigation of mouse trace, using powder, Numbers of digged holes, saturated bait consuming.
方法目测法、鼠迹调查法、粉片法、掘开洞数法、饱和食饵消耗法。
3
Grandpa mouse answer, "These holes are all very clean, it isn't the mice's holes!"