The origin of vertebrates and their ancestry are problems still obscured by too few facts.
脊椎动物的起源和它们的始祖问题，由于事实太少仍然不很清楚。
The origin of vertebrates has always been a core question in evolutionary biology. It is well accepted that vertebrates and invertebrate chordate derived from a common ancestor.
脊椎动物的起源是进化生物学研究的核心问题之一，目前人们普遍认为脊椎动物与无脊椎动物中的脊索动物起源于同一个原始祖先。
Amphioxus is becoming an emerging model organism for insights into the origin and evolution of vertebrates.
文昌鱼是研究脊椎动物起源与进化十分珍贵的模式动物。
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