"後ろにいる人ですら気づかない"
- Even the people behind don't notice.
「痴漢のほとんどは、後ろの人にすら気づかれないように犯行に及ぶので周りの人も気づきにくい」
- Most molesters commit their crimes in a way where even the person behind them doesn't realize, making it difficult for those around to notice.
- The majority of molesters commit their crimes in such a way that even the people behind them are unaware of their actions so it's difficult for the people around to notice.
ご質問ありがとうございます。
「後ろにいる人ですら[気づかない](https://eikaiwa.dmm.com/uknow/questions/51024/)」は英語で「The people behind them don't realize」と言います。
また、「痴漢のほとんどは、後ろの人にすら気づかれないように犯行に及ぶので周りの人も気づきにくい」は英語で「With most groping incidents, the people that are behind the perpetrators don't even realize when it happens」と言えます。
ご参考になれば幸いです。
アメリカ合衆国 
