Spectral density
[电] 频谱密度
🧩 词语组成解析
spectral
['spɛktrəl]
adj. （似）鬼的;幽灵的;谱的;光谱的;
🗣️ 情景例句
A friend in need is a friend indeed.
患难朋友才是真正的朋友。
We first make our habits, and then our habits make us.
我们先养成习惯，然后习惯又左右我们。
Hello, Lily! How are you today?
喂，莉莉，你好。