例句1：But evidence is accumulating that the biggest extinction of all, 252.3m years back, at the end of the Permian period, was indeed also triggered by an impact.
(1)But evidence is accumulating that……
(2)be triggered by…..
例句2：Nevertheless, though the trigger was the same, the details are significantly different, according to Eric To hover of the University of Western Australia.
例句3：When the dinosaurs vanished they were accompanied by more than 70% of the other animal species on Earth.
(1)vanish 代替die out, be extinct.
The idea that an impact caused the Permian extinction has been around for a while.
(1)The idea ……has been around for a while
例句5：These may have weakened the world’s ecosystems, making them vulnerable to an external shock.
(1)Be vulnerable to…..