Trapped by an army of urchins,被一群红海胆群困住

an army of 一大批, 一大群

At the concert, there was an army of bodyguards.

音乐会上有大批的保安。

An army of ants swarmed over the sand-hill.

一大群蚂蚁在沙丘上爬动。

Pycnopodia has more than met its match,海星不仅仅遇到了克星

more than不仅仅

This city has a population of more than 1,000,000.

这个城市人口超过一百万。

More than one person has been concerned in this.

不止一个人与这件事有牵连。

Starfish are able to quickly regrow a lost limb.海星失去的触手很快就能再生

be able to能够

As I had plenty of money I was able to help her.

我钱很宽裕，能帮助她。

I am able to pick you up on the short wave radio.

我能用短波收音机收听到你的信号。

but in fact it's some of the smallest that can make the biggest impact.但有些最小的品种，其实具有最重大的影响力

in fact事实上；实际上

She is by no means poor: in fact, she's quite rich.

她可不穷，其实她很阔。

In fact we were innocent of the crime.

事实上，我们是无辜的。