1. His separation from his friends made him very sad.
    他和朋友分别使他十分难受。

2. Separation anxiety was a malady she was intimately acquainted with.
    分居焦虑是她深切体验到的一种心病。

3. She told me of my grandfather's devotion to his own children, and how difficult it was for him to send his daughter to America for her education, fearing that same separation (分离).
    她给我讲了我外公对他自己的孩子的爱，对他来说送女儿去美国受教育有多困难！他害怕发生与他和他母亲一样的分离。

4. — Whether because of abandonment, separation, divorce or death of a spouse, marriages are dissolving with increasing frequency.
    ——不论是因为被遗弃、分居、离婚，还是因为配偶死亡，婚姻解体的频率都在上升。