在分别应用时，直立植物和砾石覆盖均可以有效地增大阻力系数。

When applied separately, standing vegetation and clods can increase drag coefficient effectively.

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在分别应用时，直立植物和砾石覆盖均可以有效地增大阻力系数。

When applied separately, standing vegetation and clods can increase drag coefficient effectively.

youdao