当它们迅速摆腿，它们把展开的脚用力蹬水，如果保持了速度，那么所产生的小气涡能让它们不沉入水里。
As they rapidly churn their legs, they slap their splayed feet hard against the water, creating a tiny air pocket that keeps them from sinking, provided they maintain their speed.
采用非定常涡格法对摆推水翼进行了势流数值分析并进行了相关试验研究。
Numerical calculation of unsteady potential flow for swinging hydrofoil is processed with Vortex Lattice Method (VLM) and interrelated hydrofoil experiment was also made.
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