This family has been engaged in boatbuilding for generations, and their craftsmanship is exceptional.

boatbuilding 是由名词 boat（船）和动名词 building（建造）组成的复合词。boat 指"船只"，building 来自动词 build（建造），加上 -ing 表示"建造的行为或行业"。 boatbuilding 指"造船业"或"造船工艺"，特指制造船只的行业或技术。