这个板块是在两边生长的，由于没有中间的沟槽，两个脊必然是分开的。
This plate is growing on both sides, and since there is no intermediate trench, the two ridges must be moving apart.
也叫做锯齿龟，因为背甲中间的脊线上有黑色突出来的瘤（因品种而异）。
Also called saw backs due to knob-like projections from the top of the dorsal midline carapace (varies by species).
冰岛尤其是由火山构成的，因为它是由一个热点和一个海中间的脊的交点形成的。
Iceland is peculiarly volcanic because it is formed by the intersection of a hotspot and a mid-ocean ridge.
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