为了优化三峡电站进水口体形，试验研究采用了与传统大进水口不同的小进水口体形方式，并将进水口的喇叭口段布置成对称状。

By means of test research, a small sized inlet with a symmetrical bell-mouth form instead of traditional large sized one will be adopted for the TGP's hydropower station.

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脊索动物两侧对称、三胚层，分节的体腔，在胚胎发育的早期过程中，显示为后口类型。

Chordates are bilaterally symmetrical, triploblastic, segmented coelomates which demonstrate a deuterostomic pattern of early embryonic development.

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