put a letter in everyone's mailbox warning residents about noise
Send a letter to every resident warning them about noise
「騒音に関する注意文書を各部屋のポストに投函する」= put a letter in everyone's mailbox warning residents about noise / Send a letter to every resident warning them about noise
ボキャブラリー
put ~ in = 入れる、投函する
letter = 手紙
everyone = みんな
mailbox = ポスト
warn = 注意する
noise = 騒音
resident = 住民、住んでいる人