Bilateral animals flourished in the Cambrian so tracing their origins is crucial to understanding the pace of animal evolution.
两侧对称动物在寒武纪繁衍旺盛，因此追踪它们的起源对了解动物是如何进化而来的十分重要。
2
Conclusion the permanent ligation of bilateral common carotid artery in combination of behavioral limitation could provide the ideal animal models for experiment and clinical study of PSD.
结论大鼠双侧颈总动脉永久性结扎结合行为限制可为卒中后抑郁的实验及临床研究提供较为理想的动物模型。
3
Made the animal models of bilateral radius defect.