常见例句双语例句There exists abundant Radiolaria in the chert, and the radiolarian association suggests that the chert was formed in the last period of Late Jurassic.硅质岩中含有大量放射虫，放射虫组合显示硅质岩的沉积时代为晚侏罗世晚期。 返回 radiolarian chert