Some spiders produce a single thread.

有些蜘蛛只吐一条线。

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These tiny threads come together to form a single thread.

这些细线聚在一起形成一条线。

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She also devised a special reel to draw the fibres from the cocoon into a single thread so that they would be strong enough to be woven into fabric.

她还设计了一个特殊的卷轴，把蚕茧里的纤维拉成一根单线，这样它们就足够结实，可以织成织物。

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If there's a single thread running through Finnish music, it's a willingness to subvert norms.

NPR: The Sounds of Finnish Musical Experiments

Thanks to an engineer's trick called "wave division multiplexing, " a single fiber-optic thread can carry upwards of 10 trillion bits per second.

FORBES: Digital Rules

From the valley below, each pier and mast merge to look like a single needle with an elongated eye: Foster's drawings, in fact, depict a thread piercing the eye of a needle.

WSJ: A Concrete Ribbon Through the Clouds | Millau Viaduct | Masterpiece by Joseph Giovannini