尽快回信
Please write back to me soon.───请尽快给我写回信。
Write back soon.───回复。
They would surely write back soon and send a cheque.
went back on───违背；背弃
white bacon───白腊肉
write a song───写首歌
write back───回复，回信
on the back foot───处于不利境地
going back on───违背；背弃
gone back on───违背；背弃