Heidi in her transport was running to and fro: "Grandfather, come out!"

　　海蒂在路上里跑來跑去，喊著：“爺爺，快出來！”

　　The streets were filled with people running to and fro about their tasks.

　　街上滿是為了工作跑來跑去的人。

　　Here the wind was roaring through the branches and the tree-tops were swaying to and fro.

　　風(fēng)呼嘯著吹過樹枝，樹冠來回搖擺。