sī sī rù kòu

[explanation] filar silk: every silk; Buckle: one of the main parts on a loom. When weaving, every silk thread must pass through the reeds. Metaphor is done very carefully, methodically and in tune with each other.

[Source] Qing Xia Jingqu's "Wild Sour Exposed Words" is the 27th time: "This is a thread, secretly throwing the rope, as the Taoist says, the boat of the Three Gods cannot be near, and the nearest one needs to be led back by the wind."

[example] and those subtle twists and turns, but also ~, once in a thousand years. (Zhu Ziqing's "Classic Talk, The Eighth Warring States Policy")