This principle is called " herd immunity" .

这一原则被称为“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."

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

We saw a herd of deer of twenty.

我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 时而安抚羊。

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

一身黑毛的我不用再躲在羊群里了。

The herd are protecting their calf.

群在竭力保护。

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.

许多从坑壁上的大量骨头中产：某种灾难，如火山爆发或突如其来的洪水，杀死了这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，上的学校简陋不堪，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。

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

目前，群可以在围栏内活动。

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

“乌姆里奇教授跟我们的那些马发了冲突。”邓布利多说。

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

我们习惯了放牧动物，也教我们的孩子放牧。

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。

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.

我一的梦就是能看到成群的野动物，茂盛的丛林和大片的雨林中到处是鸟类和蝴蝶在飞舞。但我现在不知道，甚至它们是否会在我以后的孩子们看到前就消失。

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

脚下蜿蜒的溪水形如轭，一群野在旁吃草。

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

我们刚刚去看了一群马斯特管的 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用。

But he did make it back to his herd.

但他还是回到了群体中。

In the dry season, herds as large as 400 gather around the Minneriya reservoir to graze on its fertile grasses.

在旱季，400多头大象聚集在米内日亚水库周围，享受着肥美的嫩草。