在绘画中，画笔的每一笔都贡献于最终的艺术品。

In painting, each ___stroke of the brush contributes to the final artwork.

画中大胆的一笔传达了强烈的情感。

The bold ___stroke in the painting conveyed intense emotion.

他用钢笔迅速一挥，签署了文件。

With a swift ___stroke of his pen, he signed the document.