That could provide a cheaper and greener alternative to carbon fibres, which are usually made from oil-based polymers.

这可能为碳纤维提供一种更便宜、更环保的替代品，而碳纤维通常是由石油聚合物制成的。

Steel, noted Mr Musk, has a higher melting point than carbon fibre, making re-entry easier. It is also an order of magnitude cheaper.

马斯克指出，钢铁的熔点比碳纤维高，因此重返大气层更容易。其价格也便宜一个数量级。

But eventually he injured himself during a ballad when he rode over a knot in a carbon fibre cord the length of an aircraft wing.

但是最终在（演奏到）一曲民谣时他伤了自己，当时他正骑车越过一条飞行器翅膀那么长的碳纤维绳子上的一个绳结。

It has the same wingspan as that of an Airbus A-340 passenger jet, but thanks to its carbon fibre construction, weighs only as much as an average car.

这架飞机的翼展和空客a-340客机类似，但多亏了其碳纤维结构，其重量仅相当于一般的汽车。

In another workshop elsewhere in Ukraine, a team of 30 volunteers is cutting carbon fibre with lasers to produce kamikaze quadcopters that deliver 1.5kg of explosives to targets up to 8km away.

在乌克兰其他地方的另一个车间，一个由 30 名志愿者组成的团队正在用激光切割碳纤维来生产神风敢死队四轴飞行器， 这些飞行器可以向最远 8 公里外的目标运送 1.5 公斤的炸药。