compass needle

基本解釋

Here is the set of points that defines the compass needle.
這里是點的集合，它定義羅盤針。
A compass needle always points to the north.
羅盤的指針總是指向北方。
The massive magnetic field of a powerful MRI machine aligns the nuclei of the atoms in the same direction, much as a magnet pulls a compass needle.
一臺功能強(qiáng)大的磁共振成像儀的強(qiáng)大磁場能使原子核往同一方向排列成行，就好像磁鐵吸引羅盤的指針一樣。

Suddenly we were coming about again, and I watched the compass needle whirl to its new heading.
NPR: Excerpt: 'Skybreaker'
In 1745, an English physicist named Gowin Knight developed a compass with a steel needle, which retained its magnetism longer.
FORBES: Magazine Article
Once again, we accompany Captain Jack Sparrow (Johnny Depp) as he pursues his fate—or the needle of his compass—across the waters.
NEWYORKER: Pirates of the Caribbean: Dead Man's Chest