監視網: surveillance network

関与: taking part in / 干与: being concerned with

関与: take part in / 干与: be concerned with

巻頭: opening page of book; beginning of an essay; prefatory / 敢闘: fighting bravely / 完投: going the whole distance; pitching a whole game / 官等: official rank / 竿頭: top of a pole

関東: Kanto / 間島

(poetic, rare) a return letter, a written reply

(poetic, rare) to send a return letter, to reply in writing

(literary) return; repayment / (literary, by extension) reply letter / (literary, by extension) messenger sending such a letter

(poetic, rare) to send a return letter, to reply in writing

Synonym of イスラム教 (Isuramu-kyō, “Islam”)