noun🔗Share西塔，θ，希腊字母θ。 The eighth letter of the Modern Greek alphabet, ninth in Old Greek: Θ, θ.""In Greek class, we learned that theta is the eighth letter of the alphabet." "在希腊语课上，我们学到西塔（theta）是希腊字母表的第八个字母。languagemathChat with AIVocabulary GamePractice Reading
noun🔗ShareTheta 角，角度。 The measure of an angle."The math problem asks us to find theta, which is the angle of the triangle. "这道数学题要求我们求 theta 角，也就是三角形的那个角度。mathscienceChat with AIVocabulary GamePractice Reading
noun🔗ShareTheta值，时间衰减 The sensitivity of the value of a derivative with respect to time; the "time decay"."The option's theta was significant; each day, its value decreased noticeably due to time decay. "这个期权的 Theta 值很大，所以随着时间衰减，它每天的价值都在明显下降。financebusinessmathtimeChat with AIVocabulary GamePractice Reading
noun🔗Share西塔波，θ波 Designating a level of brain activity as measured by electroencephalography having a frequency of between four and seven cycles per second (associated with drowsiness in adults)."As the meditation session deepened, the brainwave monitor showed a shift from alpha to theta, indicating increased relaxation and a state close to sleep. "随着冥想的深入，脑波监测仪显示脑电波从阿尔法波转换到了西塔波，表明放松程度加深，并接近睡眠状态。physiologymindmedicinefrequencysensationChat with AIVocabulary GamePractice Reading
noun🔗ShareTheta, 无声齿擦音，θ。 The voiceless dental fricative represented by θ."In phonetics class, we practiced making the "th" sound in "thin," which is represented by the Greek letter theta. "在语音学课上，我们练习发 "thin" 中 "th" 的音，这个音用希腊字母 theta（θ） 表示，也就是无声齿擦音。phoneticslanguagelinguisticswordChat with AIVocabulary GamePractice Reading
