他用登山杖支撑着身体，稳步前进。

He uses trekking ___poles to support himself and moves steadily.

他们对环保问题的立场处于两个极端。

Their stances on environmental issues are at opposite ___poles.

企鹅生活在南极附近。

Penguins live near the South ___Pole.

我们用了两根长杆来支撑帐篷。

We used two long ___poles to support the tent.