Chordates are bilaterally symmetrical, triploblastic, segmented coelomates.
脊索是双边对称的，三叶裂的，分段的腔壁。
Having a bilaterally symmetrical corolla somewhat resembling a butterfly, characteristic of most plants of the pea family.
有蝶形花冠的，蝶形的有蝴蝶似的左右对称花冠的，是大部分豆科植物所具有的特点。
Distribution of the lesion were diffuse bilaterally and symmetrical.
病变弥漫分布于两肺野，呈对称性；
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