- No longer constrained by shells,
它们不再受到壳的限制 - they've evolved into almost every size and shape.
进化出了各种大小和形状 - But this pitch-black world isn't theirs alone.
但这个漆黑的世界并不只属于它们 - Arthropods, like this spider crab, live here too...
这里还有节肢动物 比如这只蜘蛛蟹 - feeling their way across the ocean floor.
它们在海底摸索着前进 - Alongside them, the vertebrates.
它们周围还有脊椎动物 - With little food on offer, down here, they're rare.
在这里 食物很少 因此它们的数量也很稀少
Arthropods, like this spider crab, live here too... 这里还有节肢动物 比如这只蜘蛛蟹
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