For years, we have assumed it was the abundant plant life of the Mesozoic that allowed these giants to thrive.
多年来，我们一直认为是中生代丰富的植物种类使这些巨型生物得以繁衍生息。
2
The chipmunk population increased strikingly due to two successive years of abundant acorn crops in the forest.
金花鼠数量显著地增加，是因为森林里连续两年丰硕的橡子收成。
3
For the next 1,500 years, its inhabitants enjoyed a somewhat warmer and damper climate than today, living in a well-wooded steppe area where wild cereal grasses were abundant.