1.with
E.g. We(不用are) not only can send email with( 不用by) words, but also with photos and videos.
2. Juvenile male female ➡️ adj.
Juveniles males females ➡️ N. Plural
A juvenile person➡️ N. single
A male person
A female person
3. There are 15% points students like sport more than art, at 45% and 30% respectively.
不能直接用15%, 要用也是 50%.