Glossary term: 潮汐
Description: 在地球上，引力几乎是恒定的，我们称之为向下的引力。但在更远的距离上，引力的强度和方向会发生变化，这些差异被称为潮汐力。例如，地球和月球由于相互的引力吸引而围绕着一个共同的质心运行，但地球靠近月球一侧的物体会在引力作用下加速向月球运动，而地球另一侧的物体所受的加速度会小一些。地球上的海水会在这些潮汐加速度的影响下，地球表面近月侧和对侧会形成 "潮汐隆起"，从而产生地球潮汐。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
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