彼女は僕より2歳年下だ。
tbd
She is two years younger than me.
She's two years younger than me.
她比我年輕兩歲。
She is two years younger than I.
より
1. than
2. rather than, instead of, over, above
3. from, out of, since, at, on (and after)
4. except, but, other than
5. more
更,更加