The reason for this line is not entirely understood, says Dr Shank, but it is thought to be related to the difficulty that species have had in crossing the deepwater under this line.
这条分割线的成因不被人完全了解，沙克博士说，但它被认为和分割线下横跨深海物种上的差异有关。
2
For his shrunk shank and his big manly voice.
他缩小小腿，他的大男子气概的声音。
3
Leadpipe - features Remington large shank receiver and longer taper designed for traditional response characteristics. For SL4747 and SL4762.