time flies like an arrow (idiom); How time flies!
光 · 6 strokes
Pictograph of fire on top of a person.
阴 · 6 strokes
The traditional characters 陰 (Yin) and 陽 (Yang) were simplified to 阴 and 阳. In Chinese philosophy, the moon (月) corresponds to Yin (阴) and the sun (日) corresponds to Yang (阳).
似 · 6 strokes
Phonosemantic compound. 亻 represents the meaning and 以 represents the sound.
箭 · 15 strokes
Phonosemantic compound. ⺮ represents the meaning and 前 represents the sound.
光阴似箭,转眼间我们已经毕业十年了。
Time flies like an arrow; in the blink of an eye, we've already graduated for ten years.