We see polar bears as a sentinel of climate change.

“我将北极熊看作气候变化哨兵。

Fling the lying sentinel over the cliffs.

“把那个撒谎岗哨扔到悬崖上去。

Strange sights and sounds occurred at different moments to bewilder the anxious sentinels.

不时出现令人奇怪景象和，这时，焦急哨兵总会受到迷惑。

It is a grandiose burial site. A huge cross stands sentinel in the Guadarrama hills.

这片墓地气势宏，一块巨十字架如同哨兵一样守卫在瓜达拉马山上。

Shanghai watches for 15 categories of infectious disease at more than 5,700 sentinel sites.

上海设立了超过5700个哨点，密切关注15类传染病。

They found that new immigrants rarely served as sentinels.

他发现，新加入猫鼬很少担任哨兵。

We are through the line of sentinels. Everything depends on speed. Hurry on!

咱已经闯过了警戒线了。一切就靠迅速了，快跑！

Their wakeful sentinel had descried danger, and this was his warning.

他那警觉岗哨发现有危险情况，发出警报。

The colossal pillars stand mute sentinel over a remote alpine wilderness.

这些巨柱静静地伫立在偏远高山荒野上。

Plotz thinks the oxpeckers may have evolved their sentinel behavior because it protects their convenient food source.

普洛茨认为，牛椋鸟可能为了保护方便食物来源，而进化出哨兵行为。

You looked at that, and we thought about it and said, that's brilliant, because they become sentinels.

看看这个主意，我认为这真不错，因为它成为了哨兵。

When an individual is on sentinel, they are basically on guard duty for the rest of the group.

“当个体侏獴放哨时，它基本上是在为这个群体其它成员站岗守卫。

She said diseases like dengue, " provide us a really good sentinel of what is happening with climate change."

她说，像登革热这样疾病“为我提供了一个关于气候变化非常好预警。”

On a rock which overlooked the track, showing out dark and plain against the sky, there stood a solitary sentinel.

原来有一块俯临山路岩，在天光衬托之下显得非常黯黑而单调，岩上孤零零地站着一个防哨。

Half an hour later one of the sentinels cried out that a horse and rider were coming down the trail.

半小时后，一个哨兵喊道，有一匹马和骑马人正沿着小路走来。

“What’s the news? ” as if the rest of mankind had stood his sentinels.

“有什么新消息？ ” 就好像其他人都站着他哨兵一样。

They helped to track and hunt prey, and might have served as sentinels to guard camps and warn of approaching enemies.

它帮助人类追踪和猎杀猎物，还可能充当哨兵，守卫营地和警告接近敌人。

Every empty, shell-pitted house they had passed that day, every gaunt chimney standing sentinel over smoke-blackened ruins, had frightened her more.

那天他经过一幢弹痕累累、空无人烟房子，一个像哨兵似站在火后废墟上干瘦烟囱，都使她愈来愈害怕了。

Our center now has become a sentinel of hope for the people of Khayelitsha.

我中心现在已成为 Khayelitsha 人民希望哨兵。

Each one of us is a sentinel.

我个人都是哨兵。