The idea behind these pillars, according to tradition and extrabiblical writings, is as follows:
Adam had prophecied that the Earth should be covered once by water and once by fire. Seth's descendants, being learned, especially in astronomy, sought to preserve the knowledge they had worked to obtain through these catastrophies. Apparently they had some uncertainty as to the order of the catastrophies, for they built two pillars on which they inscribed much of their knowledge. One was designed to be able to survive through a flood, and the other was designed to survive a great burning.

The Plates of Mormon are the Gold Plates

Polyandry is a marriage arrangent in which one woman is married to multiple men at the same time.

Normally, in Mormon-usage, poligamy does not encompass polyandry, although, by definition, polyandry is a subset of polygamy.

LDS doctrine does not apparently permit polyandry. Nevertheless, there exists some debate regarding supposed polyandrous marriages Joseph Smith may have been involved in. The exact nature of these relationships is not well known enough to really be able to determine if there was any real polyandry. It may also be that there is more to correct doctrine than is superficially apparent.

The guiding principle seems, clearly, to be, that application of biblical language in prayer, enhances our devotion, shows respect for the Lord, and brings more of a spirit of reverence to prayers. Dallin H. Oaks makes a good point regarding this principle, that this pecial language is a learned skill, yet all should pray. It is not necessary to speak biblically then, but rather to offer up the best that we have and seek to grow in our ability.
It has, rather, been reasoned, that because prophets now pray using biblical language, that this means we should, or because the Book of Mormon uses thee's and thou's, we should. The Bible is even cited as exemplary authority on this issue, it being entirely neglected that this language was not special at the time of the translation of the King James Version of the Bible. Thee's and thou's are not restricted to God. This is the same in the Book of Mormon, except that such language was less common. It is noteworthy, however, that even in modern times, thee's and thou's are used in the translation of ancient texts as they give more accuracy to the translation. The Book of Mormon does not use "thee" and "thou" as honorary pronouns for God, but rather as second person singular pronouns properly and precisely indicating the nature of the entity being addressed. This is also the case in the Doctrine and Covenants, where thee's and thou's are likewise used for all second person singular references regardless of whether or not God is being addressed. This then is the tradition under which the prophets have labored, and thus, see
ms natural for them, traditionally.
The Doctrine and Covenants, provides a good starting point to suggest the language is important for us even today. The Doctrine and Covenants is not a translation, yet it contains this biblical language. We might see this as the beginning of the modern tradition of using this language for our own prayers and the Lord responds in kind. This is highly suggestive of its importance and yet is perhaps even more telling, in that since the special language is used universally, then in our prayers, perhaps we ought to do the same. Usually this isn't an issue, however, except when giving a blessing.
The use of the special language tends to strengthen reverence, which is conducive to the spirit. Perhaps less importantly, the language is also more precise.