The exigencies of a situation or a job are the demands or difficulties that you have to deal with as part of it.
例句
...the exigencies of a wartime economy.战时经济的紧急情况
英汉词典释义
n.
急切的需要;危急
The people have to accept the harsh exigency of war.人们要承受战乱的严酷现实。Many people are forced by exigencies of circumstance to take some part in them.许多人由于境况所逼又不得不在某种程度上参与这种活动。
英英词典释义
Noun
1. a pressing or urgent situation;
"the health-care exigency"
2. a sudden unforeseen crisis (usually involving danger) that requires immediate action;