protospondylous

例句：

1. 1.The prototype of the new model is still being developed.
   新型号的原型还在开发中。
2. 2. The prototype of the new design was a success.
   新设计的原型取得了成功。
3. 3. The prototype of the new product has been tested extensively.
   新产品的原型已经经过了广泛的测试。