The community that speaks a language has learnt it, and modified it by processes almost all of which are not deliberate, but the results of causes operating according to more or less ascertainable laws.

说一种语言的社区已经学会了它，并通过过程对其进行了修改，几乎所有这些过程都意的，而根据或多或少可确定的规律作的原因的结果。

Webster also claimed to have invented words such as demoralize, appreciation, accompaniment, ascertainable and expenditure, even though these words had actually been in use for some centuries.

韦伯斯称自己发明了诸如 demoralize、appreciation、accompaniment、accertainable 和 expensation 等词，尽管这些词实际上已经使用了几个世纪。

Why do they focus on ascertainable details of immediate utilitarian relevance rather than on the long-run emotional and material benefits of family life?

为什么他们更关注具有直接实用价值的可确定细节，而家庭生活中长期的感情和物质利益呢？

They have the kind of objective truth that is ascertainable.

它们具有可确定的客观真理。