1. herds of

成群，大量（指人时含蔑视意义）

eg. It fed the largest herds of fur seals and great whales on Earth in the ages before the sealers and whalers came.

早在捕海豹人和捕鲸人到来以前，它就喂养了大量的软毛海豹和地球上体形巨大的鲸鱼。

eg. 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。 但是现在我想知道我们这些小孩是否还能再看到它们？

2. in fact

事实上，实际上

eg. In fact, you have to.

实际上，你必须要这么做。

eg. She carries her age very well. She looks 50 but in fact she's more than 60 .

她不显老，她看上去像50岁，其实已经60多了。

3. as if

犹如，好似

eg. I feel as if I had been born again.

我有一种再生之感。

eg. She works hard as if she never knew fatigue.

她工作努力，仿佛从不知疲倦似的。