I have to go to the bathroom .
她说,「我去了卫生间。」
A large meal may cause indigestion, and a large beverage will cause you to have to go to the bathroom in the middle of the night.
大吃会引起消化不良,饮料喝的过多会导致你半夜去卫生间。
That means on a plane, after you pass security, you should purchase extra water and drink enough of it on the flight so that you have to go to the bathroom to urinate.
也就是说,在通过安检登机后,要额外买水并饮用足够多的水,以入厕小便。