1、两侧对称的
...consensual 在两愿下成立的...isobilateral 二侧相等的bilaterally symmetrical 两侧对称的 ...
2、左右对称
...nt siphon (出水管 Clam (蛤) – wedge-shape muscular foot (斧足) Annelids (环节动物) Bilaterally symmetrical (左右对称) ， streamlined shaped (流线形) segmented (分节) Has chaetae (刚毛) for anchorage (固定身 体) during burrowing (挖掘...