the eighth letter of the Greek alphabet (Θ, θ), transliterated as ‘th’ 希腊字母表中第八个字母(译写为th) ■(Theta)[followed by Latin genitive](Astronomy)the eighth star in a constellation (天文)θ星(星座中第八颗星) Theta Draconis. 天龙座θ星。 ■[as modifier](Chemistry)denoting a temperature at which a polymer solution behaves ideally as regards its osmotic pressure (化)θ温度 ■[as modifier]denoting electrical activity observed in the brain under certain conditions, consisting of oscillations having a frequency of 4 to 7 hertz θ节律 theta rhythm. θ节律。
symbol for
■(θ)temperature (especially in degrees Celsius) 温度(尤指摄氏度) ■(θ)a plane angle 飞机角度 ■(θ)a polar coordinate. Often coupled with φ 极坐标(常与φ成对使用)