Halloween is on the thirty-first of October.
万圣节在十月份的第31天。
Children usually dress up.
孩子们通常会打扮一番。
They knock on people's doors and shout "Trick or treat?" for sweets.
为了获得糖果，他们敲大人的门，然后大声喊道“不给糖就捣乱”