at that precise moment: 就在那时
At that moment, there was a rattling at the door.
那时，突然出现咚咚的敲门声。
At that moment a chime sounded from the front of the house.
就在那时，房前传来一声铃。
Seeing Marcus at that moment was a great tonic.
在那一刻见到马库斯是非常令人兴奋的事。

separate from: 分离、分开
Business bank accounts were kept separate from personal ones.
银行的商业账户和个人账户是分开管理的。
The choice to separate from what we love is painful...
选择和我们的所爱分离是痛苦的