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Until a few generations ago,
在数代之前
mountain gorillas, hidden in the seclusion of their forests
山地大猩猩在丛林中过着隐居生活
were seldom seen by human beings.
很少被人类发现
But their habitat was steadily being carved away,
但他们的栖息地渐渐被蚕食
and now these gorillas are marooned on the volcanic slopes
现在这些大猩猩被孤立在火山的山坡地带
in a sea of farmland.
被无尽的农田包围
The fact that gorillas now regularly come into contact with people
现如今 大猩猩经常与人类接触
not only means an increased threat of poaching,
不仅意味着他们被偷猎者杀害的风险增加
but also of disease.
患病的风险也会增加
Gorillas have little or no resistance
大猩猩对我们身上携带的寄生虫
to the bugs that we carry.
几乎没有抵抗力
Numbers here once dropped to around 250.
这里大猩猩的数量一度降至约250头
They were facing extinction.
他们濒临灭绝
Action had to be taken.
人们必须行动起来

重点解释

The fact that gorillas now regularly come into contact with people现如今大猩猩经常与人类接触

come into进入

A flood of cheap imports has come into the shops.

大量廉价进口商品涌入商店。

The new car will come into use next month.

那辆新车将于下月开始使用。

相关短语come into sight出现(看到)

The ship came into sight out of the fog.

那艘船驶出浓雾，依稀可见。

The green fields came into sight.

一片绿色的田野展现在眼前。

not only means an increased threat of poaching,but also of disease.不仅意味着他们被偷猎者杀害的风险增加患病的风险也会增加

not only... but also不仅 ... 而且 ...

Not only is she pretty but also kindhearted.

她不仅漂亮，而且心眼也好。

They not only talked but also shouted and laughed.

他们不只谈话，而且喊叫大笑。