Barring extreme circumstances, most of these are just alibis. 除去極端的環境不說,很多這些假設不過是借口。
This hypothesis remains contentious because it assumes the existence of highly unstable conditions, which may not be attainable. 這項假說仍有爭議,因為它假設必須有非常不穩定的條件存在,而自然環境可能無法滿足這種極端條件。