1. The final brainwave state is delta. 
   最后一种脑电波状态是δ波。
2. The second tone of the diatonic scale in solfeggio. 
   ray音音名中自然间阶的第二个音阶
3. The fourth letter of the Greek alphabet. 
   △，δ希腊字母表中的第四个字母
4. of a leaf shape; suggesting a capital delta, with a point at the apex. 
   叶子的形状；使人想起大写的δ，顶部有个尖。
5. That is, they will increase from delta to theta and then to alpha and finally, when the alarm goes off, into beta. 
   即将从δ脑电波至θ脑电波、α脑电波，最后当人们完全清醒时为β脑电波。

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