一个指南针的做法:弄一碗水,在水面放一小片叶子,然后将一根针的一头在头皮里摩擦多次,然后放到叶子上,针开始旋转,它受摩擦的那头就将指向南方!
Get a bowl of water and find a small piece of leaf.
Put the leaf on the water.
Find a needle and rubber it in the hair.
Then put the needle on the leaf.
The leaf will go round now.
The needle will direct to the south pole.