Young as she is, she knows how to distinguish between friend and foe.

虽然她年轻，她懂得怎样区分敌友。

The lack of information on his condition led many, both friend and foe, to assume the worst.

由于缺乏关于他健康状况的资讯，造成很多人士(无论敌友)都以为发生了最坏状况。

Ozone is a chemical that can be both friend and foe to human beings - depending on where it is.

臭氧是一种利弊两全的化学物质。是利是弊，这得看它在哪儿出现。

Richard Holbrooke, an American diplomat known by friend and foe as a bulldozer, was accustomed to getting his way.

理查德·霍尔布鲁克，一位美国外交官，朋友和对手都认为他是个恃强凌弱的人，他做事总是我行我素。

In some people, the body is not able to produce enough cortisol. In these cases, the immune response runs amok, attacking friend and foe alike, eventually taking aim at the body's own cells.

对于一些人来说，当身体无法产生出足够多的皮质醇的时候，免疫系统就失去了控制、敌友不分，最终把目标指向了自己的细胞。