I'm afraid I have to answer a call of nature.

抱歉我要去趟洗手间。

柯林斯例句

Excuse me for a minute — I must pay a call of nature before we leave.

对不起,走之前我得先去一下洗手间.

《简明英汉词典》

I was probably off the road, behind a bush , answering a call of nature.

那时我可能刚巧离开公路, 到树丛后面解手去了.

辞典例句

I waked early to answer a call of nature.

我早起上厕所.

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