But he says it may not be possible to distinguish between biological and non-biological explanations without additional missions to Titan.
但他说：没有另外的对“提坦”的探索，区别生物和非生物解释是不太可能的。
2
Proteins containing those "non-biological" amino acids would have novel properties, and some of those properties might be useful.
蛋白质所包含那些“非生物”核酸可能包含一些新特性，其中某些特性可能颇为有用。
3
The ability to breathe sulphur compounds has long been thought to be one of the earliest stages of transition from a non-biological to a biological world.