1. 正在那时：13. make one's way to...往......(艰难地)走去 | 14. just then 正在那时 | 15. first of all 首先,第一

2. 正当那时：journey n.旅途,旅行,历程 | just then正当那时 | just then正当那时

3. 就在那时：189、just now刚才 | 190、just then就在那时 | 191、keep moving保持(向前)移动

4. 刚才：first of all 首先 | just then 刚才 | go wrong 走错

adv

1. at a particular time in the past

e.g. just then the bugle sounded