The grey shape resolved into a group of walkers.

灰色的影子慢慢呈现为一群走路的人。

Steps cut in the hillside give walkers an easy passage down the mountain.

山坡上凿出的台阶使步下山变得容易。

Walkers can unwittingly damage the fragile environment in which the birds live.

徒步旅能无意中破坏鸟类生活的脆弱环境。