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Translation

• Context: Shichijou Aria 七条アリア explains to Amakusa Shino 天草シノ the hardships of having big breasts.
• tatoeba Shino-chan no
  suki na hito ga kyonyuu-zuki no
  baai
  たとえばシノちゃんの好きな人が巨乳好きの場合
  For example, in the case [in which] Shino-chan's liked person is big-breasts-liking...
  • For example, [imagine] the person [that you] like likes big breasts...
  • baai 場合
    Hypothetical case. (noun.)
    Imagine that... (whatever come before this word.)
    You have an adjective qualifying this word, describing what "hypothetical case" you're supposed to "imagine."
  • suki na hito 好きな人
    Person [whom you] like. Romantic interest.
  • zuki 好き
    -liking. (suffix version of suki 好き, "liking.")
    -lover. Someone who likes something. Is liking something.
• doryoku suru yochi ga aru-n-desho?
  努力する余地があるんでしょ？
  There's room [for you] to put effort, right?
  • i.e. you can still do something about it.
  • Just grow some breasts, Shino-chan!
• demo watashi no suki na hito ga hinnyuu-zuki na baai
  でも私の好きな人が貧乳好きな場合
  But if the person I like likes small breasts.
• mou dou nimo naranai yo
  もうどうにもならないよ
  Already won't become anyhow.
  • Won't take any shape. Won't happen.
  • It's already hopeless. Futile.
  • There's nothing I can do about it.