Question

soliloquy和monologue对于在戏剧上表示对白这个意思是完全没有差别的，对吗

Answer 1

二者还是有区别的~

A monologue (or monolog) is when the character may be speaking his or her thoughts aloud, directly addressing another character, or speaking to the audience, especially the former. Monologues are common across the range of dramatic media (plays, films, animation, etc.). It is distinct from a soliloquy, which is where a character relates his or her thoughts and feelings to him/herself and to the audience without addressing any of the other characters.

楼主看看这个应该就明白了 ~

Answer 2

不对。
monologue在戏剧里侧重的是“独白”。