直接说就是pass water，撒尿的意思，委婉的说用I want to go to the toilet
nature calls me ...大自然的召唤（就是要方便）委婉表达
answer the call of nature, 回应自然的呼唤 就是上厕所的意思
楼上两位。。。用 take a leak 最委婉
I want to wash my hand
