短语讲解：

1. Scientists who study primates say that we are moving towards a time when species like gorillas will no longer be found in the wild .

no longer 不再，已不
例句：After about three months, I was no longer addicted to nicotine.
大约3个月后，我就不再对尼古丁上瘾了。

2. Then, there is the largest of the species, the gorilla, weighing up to 250 kilograms.

weigh up to 重达
例句：They are heavy with honey and may weigh up to 90 pounds each.
这些蜂蜜很沉，可能每块重90镑。

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