I must ask a call of nature?

I must ask a call of nature? a call of nature 翻译 和语言点 i felt the call of nature. I am answering the call of the nature answer the call of nature 请问must answer the call of nature,是离开一会儿的意思吗?上卫生间是不是可以用? May I ask a favor of you? Can I ask a favour of you? i well ask her to ()your call I'll ask her to call b____. --to joe’s wedding ,I gave him a call to ask why.A Having be 有谁知道"release the call of nature "的意思