It's built on a steel frame and covered in a lightweight material.

它本身是一副钢架，上面覆盖着轻质材料。

Alternatively, the bags could be preseeded with a lightweight binding material, like dehydrated wood chips.

或者，也可以在袋子里预先撒上轻质的粘合材料，比如脱水木屑。

The first boats were made of wood, but their modern counterparts usually comprise lightweight materials such as carbon fiber.

第一只船是木制船，但现代的船通常是由比较轻的材料构成，比如碳纤维。

Timber being a lightweight material, we have to think about how to handle  stiff joints and mount them together.

木材是一种轻质材料，我们必须考虑如何处理僵硬的接头并将它们安装在一起。

His company transforms recycled glass into a lightweight material called foam glass gravel, which can be used underneath building foundations.

他的公司将回收的玻璃转化为一种称为泡沫玻璃砾石的轻质材料，可用于建筑地基下方。

And to make our glasses even more appealing, we should consider designing them with lightweight and durable materials that provide comfort and flexibility.

为了让我们的眼镜更具吸引力，我们应该考虑使用轻便耐用的材料来设计它们， 以提供舒适性和灵活性。

Then the kinda-liquid-kinda-gas can drift out of the solid molecular structure, and be replaced by air, so you have a porous, lightweight material that retains its shape.

然后，这种似液体又似气体的物质可以从坚固的分子结构中漂移出来，被空气所取代，这样你便得到有气孔的还保持原始形状的极轻材料。

The first settlers lived in houses made of wood  and clay – both fairly lightweight materials, but as things expanded better  engineering tactics were needed.

第一批定居者住在用木头和粘土建造的房子里——这两种材料都很轻，但随着事情的发展，需要更好的工程策略。

Plus, wood has an incredibly complex architecture that makes it light yet strong — and this has actually inspired materials scientists to try copying that structure for new lightweight materials.

此外，木材具有令人难以置信的复杂结构，使其轻盈而坚固——这实际上激发了材料科学家尝试复制这种结构以制造新的轻质材料。