be the nature of the beast
US /bi ðə ˈneɪtʃər əv ðə biːst/
UK /bi ðə ˈneɪtʃər əv ðə biːst/

1.
本質, 必然如此
to be an inherent and unavoidable characteristic of a particular situation or thing
:
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Dealing with constant changes is just the nature of the beast in this industry.
應對不斷的變化就是這個行業的本質。
•
Long hours and high pressure are the nature of the beast when you work in finance.
在金融行業工作,長時間和高壓就是本質。