上海闵行航天博物馆:since then 和 after then有什么区别

since then 和 after then有什么区别 T/T at sight 和T/T after sight的区别？ since then 怎么用，顺便造个句子 since和for 翻译：Since traffic log is sent after session is。。。。。。 翻译:"ok!then,can I go out after I clean my room?和all right.I'll do it quickly Since then he was been doing the work.怎么译？用的是什么时态？ Ever since then ,I have come to know the inportances of learning to swim . Named after Allan Houston ~since 80s~~ Now is Ray Allen~~ since和as有什么区别