This principle is called " herd immunity" .

一原则被称为“群体免疫”。

I long for shadowy founts, where the birds twitter and chirp at noon from every tree; I long for blossomed leaves and lowing herds; And Nature's voices say in mystic words, " The green fields wait for thee."

向往那，蓊郁树林边清泉，鸟声鼎沸，躲避正午的炎炎，繁花落尽，果树下哞哞牛群，静谧柔和，自然纯净的天籁，绿色田野，等待着。

We saw a herd of deer of twenty.

们看见一群二十只的鹿。

He's sort of poking the pigs and checking the flocks and herds.

他时而戳戳猪 时而安抚牛羊。

I don't have to cower in a herd anymore.

一身黑毛的再躲在羊群里。

The herd are protecting their calf.

牛群在竭力保护牛犊。

Many people get the idea from the mass of bones in the pit wall that some disaster, such as a volcanic explosion or a sudden flood, killed a whole herd of dinosaurs in this area.

许多人从坑壁上的大量骨头中产生联想：某种灾难，如火山爆发或突如其来的洪水，杀一地区的整个恐龙群。

He grew up herding goats, and went to school in a tin-roof shack.

他小的时候还放过羊，上的学校简陋堪，屋顶上仅有块铁皮来遮风挡雨。

From the ships they saw herds of elk and oxen.

他们从飞船上看到成群的麋鹿和公牛。

For the moment, this herd can roam within an enclosure.

目前，牛群可以在围栏内活动。

" Professor Umbridge ran afoul of our centaur herd, " said Dumbledore.

“乌姆里奇教授跟们的那些马人发生冲突。”邓布利多说。

We're used to herding our animals and also taught our children to herd animals.

们习惯放牧动物，也教们的孩子放牧。

First of all, there's sort of a herd mentality.

首先，大家都有从众心理。

Now 82 tribes across the U. S. have more than 20,000 bison in 65 herds.

目前全美 82 个部落 65 个牧群总共有 2 万多头野牛。

In my life, I have dreamt of seeing the great herds of wild animals, jungles and rainforests full of birds and butterfilies, but now I wonder if they will even exist for my children to see.

一生的梦想就是能看到成群的野生动物，茂盛的丛林和大片的雨林中到处是鸟类和蝴蝶在飞舞。但现在知道，甚至它们是否会在以后的孩子们看到前就消失。

The new baby expands the zoo's elephant herd to six.

新的幼崽将动物园的大象群扩充至 6 头。

Near an oxbow in the creek beneath us, a herd of buffalo graze.

脚下蜿蜒的溪水形如牛轭，一群野牛在旁吃草。

We'd just been to see one of the Master's herd of yahoos.

们刚刚去看一群马斯特管的 yahoo 。

But herd immunity works only when nearly the whole herd joins in.

但是群体免疫只有在几乎整个群体都同意接种时才起作。

But he did make it back to his herd.

但他还是回到群体中。