Grey work refers to work which is incidental to the job and involves responding to situational needs.How to interpret this sentence?What's the exact meaning of "incidental" and its usage?

Grey work refers to work which is incidental to the job and involves responding to situational needs.How to interpret this sentence?What's the exact meaning of incidental and its usage? Credit unit：One credit refers to 40 hours of work.英语成绩单中的句子, refer to ,focuse on,cometo,refers to的区别 几小道英语的问题1.I_____someone_____my name when I was walking in the street.A.heard,to call B.hear,call C.heard,calling D.hear,calling2.Too much work often_____illness.A.lead B.refers C.refers to D.leads to3.______all will have the 英语翻译Text categorization refers to the task of assigningthe pre-defined classes to text documents based on theircontent.k-NN algorithm is one of top performing classifierson text data.However,there is little research work onthe use of differen 翻译Semantics refers to the study of language meaning Sex refers to the biological differences between males and females. 英语翻译the underlined word him in the article refers to 英语翻译Socialloafing refers toa) increases in socializing among membersof larger groupsb) the reduction of effort by individualswhen they work in groupsc) the loss of coordination among groupmembers’ effortsd) a tendency to blame others for th _____I have to say____all of you.A、What; refers B、What;refers to C、That;refers D、That;refers t悉心讲解下,讲明白了,就给积分! 1.He left ____ with my secretary that he would call again in the afternoon .（A）A.word B.the word2.this is an old photo of my aunt's when she had short hair ,and now she has _____.（A）A.grey hairs B.grey hair3._____ work has been done to improv Life is grey, I will be to die是什么意思 The next man was Grey.A.coming B .to come 1.The ( ) refers to someone who spends much time on the computer.2.Holding a football in hand,practitioners make it move through every joint of the body to musical accompaniment and the football seems to work with the body in a perfect way.This is a refer to 在本句中的意思Calvinism refers to the religious doctrines of John Calvin. CAD refers to any application of a computer to the solution of design problems翻译 英语翻译AWSOP'S FABLES refers to a collection of fables credited to Aesop. 怎么区分refer to 和refers to 这两个词组啊