Wdm
abbr. 波分多路复用（Wavelength Division Multiplex）
🗣️ 情景例句
when I was about eighteen years old.
那时我差不多十八岁。
Wisdom in the mind is better than money in the hand.
手里有钱财，不如胸中有文才。
On the first lap, Class 3 were in front.
在跑第一圈时，3班在前边。