You'd better stand close to the urinal, otherwise the pee will splash back on you.
You'd better stand right in front of the urinal. If you don't you'll get splashed with your own pee.
ーYou'd better stand close to the urinal, otherwise the pee will splash back on you.
「便器に近く立った方が良いよ。じゃないとおしっこが跳ね返ってくるよ。」
urinal は男性用の小便器の言い方です。
splash back「跳ね返る」
ーYou'd better stand right in front of the urinal. If you don't you'll get splashed with your own pee.
「便器の真正面に立った方がいいよ。そうじゃないと自分のおしっこが跳ねかかるよ。」
stand right in front of ... で「…の真正面に立つ」
get splashed 「跳ねかかる」
pee「おしっこ」
ご参考まで！
カナダ 
