Pigs have a keen sense of smell, which is why they are used to find truffles.猪的嗅觉非常灵敏，所以被用来嗅探块菌。He gave her a box of truffles for Christmas.他送给她一盒松露巧克力作为圣诞节礼物。The Dordogne region's gastronomic specialities include truffles and foie gras.多尔多涅地区的美食特产包括块菌和肥鹅肝。