一只大雁的翅膀扇动空气，在身后留下一股气流。
A goose's wings churn the air and leave an air current behind.
当一股气流自由膨胀时，运动着的气流构成一个假想的圆锥体，其轴线与气流的轴线相重合。
When an air jet is allowed to expand freely, the moving air is contained within an imaginary cone whose axis is coincident with that of the air jet.
开发者解释说，空气净化无人机在飞行的时候会产生一股气流，能吸走吸尘器会漏掉的细小颗粒物。 。
Thee air-cleaning drone generates an airflow as it flies, collecting particles that a vacuum would miss, the creators explain.
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