一条巨蟒，被认为是恐龙消失时在陆地上行走或至少滑行的顶级捕食者。
A titanic snake has been identified as the top predator to walk, or at least slither, the land when the dinosaurs disappeared.
问题是，人们通常不能直接观察竞争，而必须从一个物种的扩展或增加和同时另一个物种的减少或消失来推断。
The problem is that competition ordinarily cannot be observed directly but must be inferred from the spread or increase of one species and the concurrent reduction or disappearance of another species.
这些气泡，每一个都是一个宇宙，就像沸水里的气泡一样存在或爆破消失。
These bubbles, each being a universe, pop in and out of existence like bubbles in boiling water.
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