We see polar bears as a sentinel of climate change.

“我将北极熊看作气候变化的哨兵。

Fling the lying sentinel over the cliffs.

“把那个撒谎的岗哨扔到悬崖上去。

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

不时出现令人奇怪的景象和声音，每每这时，焦急的哨兵总会受到迷惑。

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

这片墓地气势宏大，块巨大的十字架如同哨兵样守卫拉马山上。

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

上海设立超过5700个哨点，密关注15类传染病。

They found that new immigrants rarely served as sentinels.

他发现，新加入的猫鼬很少担任哨兵。

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

咱已经闯过警戒线。就靠迅速，快跑！

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

他那警觉的岗哨发现有危险情况，发出警报。

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

这些巨大的石柱静静地伫立偏远的高山荒野上。

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

普洛茨认为，牛椋鸟可能为保护方便的食物来源，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，它基本上是为这个群体的其它成员站岗守卫。

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

她说，像登革热这样的疾病“为我提供个关于气候变化的非常好的预警。”

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

原来有块俯临山路的岩石，天光衬托之下显得非常黯黑而单调，岩石上孤零零地站着个防哨。

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

半小时后，个哨兵喊道，有匹马和骑马的人正沿着小路走来。

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的敌人。

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

那天他经过的每幢弹痕累累、空无人烟的房子，每个像哨兵似的站火后废墟上的干瘦的烟囱，都使她愈来愈害怕。

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

“有什么新的消息？ ” 就好像其他人都站着他的哨兵样。

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

我的中心现已成为 Khayelitsha 人民希望的哨兵。

Each one of us is a sentinel.

我每个人都是哨兵。