noun🔗Share四元组，四数组，四人组 A group or set of four people or things."The singing group was a quaternion, with each member handling a different harmony part. "这个演唱组合是个四人组，每个成员负责一个不同的和声部分。groupnumberChat with AIVocabulary GamePractice Reading
noun🔗Share四音节词, 四音步词 A word of four syllables."In our phonics lesson, the teacher pointed out that the word "quaternion" is a good example because it is a quaternion, a word of four syllables. "在我们的语音课上，老师指出“quaternion”这个词是个很好的例子，因为它是一个四音节词。languagewordnumberlinguisticsChat with AIVocabulary GamePractice Reading
noun🔗Share四元数 A four-dimensional hypercomplex number that consists of a real dimension and 3 imaginary ones (i, j, k) that are each an independent square root of -1. They are commonly used in vector mathematics and in calculating the rotation of three-dimensional objects."The video game developer used a quaternion to smoothly rotate the car model on the screen, avoiding the "gimbal lock" problem that can occur with simpler rotation methods. "这位游戏开发者使用四元数来平滑地旋转屏幕上的汽车模型，避免了使用较简单的旋转方法时可能发生的“万向节锁”问题。mathphysicsnumberspacecomputingtechnicalChat with AIVocabulary GamePractice Reading
