原文章由 珀珀,慧慧媽 於 08-9-23 17:51 發表
其實我都問過呀囡,她是有做過不過只是玩下而已,而且佢個囡又無話唔鐘意只是跑來跑去......我只係覺得那個亞媽太緊張,有時這些小事是可以等小朋友自己解決 ...

原文章由 Holmanma 於 08-9-23 22:38 發表
cissyma,
yes, this is a buckling effect. like a ruler, if you fix the side "0" cm on the desk and you bend the other side (top side), the higher the area (say, 20cm), the more deviation from the cent ...


