用指向标指示方向的地图，指向禁止的箭头一般指示______方，没有指向标的地图通常采用“______，______”的规定确定方向．

翻译下列短语并完成句子。

1. a balanced diet ____

2. keep the balance of nature ____

3. keep one' s balance___

4. lose one's balance ( =be out of balance)___

5.  He ______ and hurt himself when he went upstairs.

6. It is difficult to for you to _____ onan icy pavement.