因为这个原因，柚木是修建铁路的一种重要材料。
For this, teak wood is an important railway building material.
这三只小猪，使用本地区的原产材料，各自修建了一幢美丽的房屋。
Using materials that were indigenous to the area, they each built a beautiful house.
这三只小猪，使用本地区的原产材料，各自修建了一幢美丽的房屋。
Using materials that were indigenous to the area, they each built a beautiful house.
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