application of building mastics

例句：

1. 1. Thebuilders used a mixture of masticand sand to build the walls.
   建筑工人用一种混合物的砂和树脂来建造墙壁。
2. 2. The ancient Romans used mastic as a building material.
   古罗马人使用树脂作为建筑材料。
3. 3. The carpenter appliedthe mastic to the wood to makeit waterproof.
   木匠将树脂涂在木头上使其防水。