Look, whoever is making that flapping sound, quiet down.

谁在弄出那翅膀拍打的声音？静下来！

youdao

Then I hear a flapping sound; it's near, but it's soft, like a lullaby.

我听见一阵拍打的声响，很近，很轻，就像一首摇篮曲。

youdao

After several days of rain, a gust of cold was blowing through the bald branches in the woods with a flapping sound.

接连下了几天雨，一阵冷风吹得光秃秃的树枝呼呼地响。

youdao

Along with the flapping, the robotic bird included a small sound generating system to play authentic calls and swamp noises.

ENGADGET: Alt-week 3.2.13: A mission to Mars, robosparrow and facial recognition in fertility treatment

While the project might sound a little bit gruesome, the research helped gather data to support the hypothesis that wing flapping is often used to deter rivals.

ENGADGET: Alt-week 3.2.13: A mission to Mars, robosparrow and facial recognition in fertility treatment