钻头必须缓慢转动，以保证钻孔平整光滑。

The drill should be slowly rotated to ensure a clean hole.

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绿叶的荣枯乃旋涡之急转，而更大的漩涡在群星间缓慢转动。

The birth and death of the leaves are the rapid whirls of the eddy whose wider circles move slowly among stars.

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当椅子缓慢转动时，他们的眼睛能“重新定到”视觉的指示物上，但对于迅速的运动，就不能校正。

Their eyes can "reanchor" on visual cues when the chair moves slowly, but they cannot compensate for swift movements.

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