1. 紧急情况;危急关头;迫切需要
The exigencies of a situation or a job are the demands or difficulties that you have to deal with as part of it.

1. a sudden unforeseen crisis (usually involving danger) that requires immediate action

e.g. he never knew what to do in an emergency

Synonym: emergencypinch

2. a pressing or urgent situation

e.g. the health-care exigency