The Book of Mormon - Writings of Nephi and Isaiah

Many evidences supporting The Book of Mormon have emerged since it was first published  in 1830.  Although I have written of the importance and necessity of receiving a testimony by the power of the Holy Ghost, I have had my testimony strengthened by other means as well.  

One of my favorite pieces of evidence occur in the writings of the prophet Nephi.  In this particular grouping of writings Nephi is quoting the writings of the prophet Isaiah, which had been preserved for him and his posterity on the Brass Plates.  The verse I am referring to is in 2 Nephi 12:16 and it reads as follows -

 16 And upon all the ships of the ^asea, and upon all the ships of Tarshish, and upon all pleasant pictures.

At first glance this really doesn't mean anything to the causal observer.  However, when compared to the verse from Isaiah in the KJV of the Bible we can see a difference.  

Isaiah 2:16 -

16 ^aAnd upon all the ships of Tarshish, and upon all pleasant pictures. 

The Isaiah verse is missing something in the fact that it says nothing about the "ships of the sea."  It only mentions the "ships of Tarshish."  

Many critics would simply use this as a means to claim that Joseph Smith must have embellished the verse and/or added his own interpretation of it, either to make himself look like a prophet who is inspired or to give validity to the fact that he didn't just copy parts of the Bible.  However, neither is true.  There is a third option, and it is the correct option.  

In the Greek version of the Bible, called the Septuagint Bible, we find something rather interesting.  In the verse in Isaiah 2:16 it reads as follows - 

16 και επι παν πλοιον θαλασσης και επι πασαν θεαν πλοιων καλλους

(translation)

16, and upon every seagoing vessels and upon all Theano ships Kallis

The Greek version mentions seagoing vessels, and doesn't specifically mention the ships of Tarshish (although the ending of the verse isn't easily translated, so it could be the same thing).  

The overall point I am trying to make is that it seems highly unlikely that Joseph Smith, who knew neither Greek nor was practiced in theology at the time of translation, would have paid close enough attention to one single verse of scripture to worry about making sure it matched up with both the English version of the Bible and the Greek version of the Bible.  

My witness is that the Book of Mormon is a true book and that Joseph Smith was the translator of it, and that he did so by the gift and power of God.