because the dogs feel thin ice underfoot and won't lead travellers into trouble.因為狗對薄冰很敏感能保護人類避免危險

lead into:通往, 引入

This gate leads into the courtyard.

這門通向院子。

A policy of this type could lead into serious complications.

這種政策可能導致嚴重的混亂。

Old-timers, like David, know the ice is as well as we know the streets in our local neighbourhood.像大衛一樣的當地居民對冰地的熟悉度不亞于我們對鄰里街道的了解程度

as well as:和 ... 一樣

He is a friend in word as well as in deed.

他是個言行如一的朋友。

She can speak Japanese as well as English.

她會說日語和英語。

So, David and his friend, Laimikie, have taken on a new job.所以大衛和朋友萊米奇就有一項新任務了

take on:接受, 從事

But I'm not qualified to take on the job.

但我沒有條件擔任這項工作。