trong lúc đó trong lúc ấy 
meanwhile like: lúc đó → →
in der Zwischenzeit ☊ 
trong lúc đó ☊ 
在这段时间里 ☊ zài zhè duàn shí jiān lǐ in der Zwischenzeit ☊ trong lúc đó ☊ ☊ Jetzt ist es Zeit, Geld zu tauschen. ☊ Bây giờ là lúc đối tiền. ☊ (Lektion 5, Nr. 41) In der Zwischenzeit hat das Gift angefangen zu wirken. ☊ Trong lúc đó chất độc đã bắt đầu có tác dụng. ☊ (Lektion 53, Nr. 751) My essay's due next Friday (= it has to be given to the teacher by then). ☊ due ☊
By then she was established as a star. ☊ establish ☊
The fashion at the time was for teaching mainly the written language. ☊ fashion ☊
Just then, someone knocked at the front door. ☊ just then ☊
At that moment he lost his balance and fell. ☊ lose ☊
At that very moment, the phone rang. ☊ moment ☊
He arrived at that very moment, as if in answer to her prayer. ☊ prayer ☊
rule sth: At that time John ruled England. ☊ rule ☊
I was living with my parents at that time. ☊ that ☊
There's a room free in Bob's house next week but you can stay with us until then. ☊ then ☊
Just then (= at that moment) there was a knock at the door. ☊ then ☊
They moved here in 2009. Until then they'd always been in the London area. ☊ until ☊