从进化论来看，这种存在是合理的并且是必须的。
In the point of the evolution theory, this exists for reasons.
拒绝和忽视自己是很痛苦的，存在即合理。
Rejecting and neglecting yourself are painful. You are worthy because you exist.
从字面上理解，取名“有理数”可能是说，这类数的存在是合理合法的。
Literally, it seems possible to say that the existence of rational number is reasonable.
这种说法的存在是具有相当合理性的。
On the basis of my observation and experience, this notion is reasonable.
结果表明：IHI定宽压力机的机构设计是合理的，但还存在一些问题。
The results prove that it is reasonable but there are some problems in mechanics design.
合理的必然是有灵魂依附的，就像人类的存在一样。
What's reasonable must have a soul, like the existence of human being.
合理的必然是有灵魂依附的，就像人类的存在一样。
What's reasonable must have a soul, like the existence of human being.
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