Below, because the somersaulting block, shifting little by little, had found points of purchase on both side walls and had gotten jammed between them.

船下面，因为翻倒下去的冰块慢恨溜下去，在两侧的冰墙上找到一个支点，维持它目前的这种地位。

They had no roots and didn't care which solid objects secured them, sand, shells, husks, or pebbles; they didn't ask their hosts for sustenance, just a point of purchase.

它们没有根，支持它们的不管是固体、是沙、是贝、是甲壳或石子，都没有什么影响，它们所要求的只是一个支点，而不是借以生长购力量。