在小学自然教学中,我们一定遇到过“磁铁不但能直接吸引铁,而且能隔着东西吸铁”的教学内容。间隔物多选用纸、塑料、玻璃等非金属物充当。那么,不同间隔物的选取以及磁铁的形状对教材的处理有何影响呢?本文以日本小学理科教科书在该问题上所走过的一段弯路为例,对此做一简要分析。 In primary school nature teaching, we must have encountered “Magnet can not only directly attract iron, but also can absorb iron across the teaching content.” Multiple choice of paper, plastic, glass and other non-metallic objects act as spacer. So, the effect of the selection of different spacers and the shape of the magnet on the processing of teaching materials? In this paper, a brief analysis of the detours taken by Japanese elementary school textbooks on this subject is given.