STEM与日常科技·英语30篇（2）

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碳纤维为什么又轻又强

Carbon fiber consists of thin strands made mostly of carbon atoms bonded in microscopic crystalline structures.
These atoms align tightly in parallel planes, giving the material exceptional tensile strength along the fiber direction.
Because carbon atoms are small and light, carbon fiber has only about one-fourth the density of steel.
When embedded in epoxy resin, the fibers form a composite that resists bending and impact without adding bulk.
Unlike metals, carbon fiber does not corrode, fatigue easily, or conduct electricity excessively.
Its stiffness-to-weight ratio makes it ideal for aircraft wings, racing bikes, and satellite components.
Manufacturers control strength by adjusting fiber orientation, weave pattern, and resin content during layup.
Even a small amount of misaligned fibers can significantly reduce performance, so precision matters greatly.
Recycling carbon fiber remains challenging because high heat breaks down the resin but leaves tangled fibers.
Despite higher cost, its energy-saving benefits in transport and aerospace justify growing use worldwide.

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Unlike metals, carbon fiber does not corrode, fatigue easily, or conduct electricity excessively. 与金属不同，碳纤维不会腐蚀、不易疲劳，导电性也较低。
Its stiffness-to-weight ratio makes it ideal for aircraft wings, racing bikes, and satellite components. 其刚度与重量之比优异，非常适合用于飞机机翼、竞赛自行车和卫星部件。
Manufacturers control strength by adjusting fiber orientation, weave pattern, and resin content during layup. 制造商通过调整铺层过程中的纤维取向、编织图案和树脂含量来控制强度。

这篇中文题目最接近哪一句？碳纤维为什么又轻又强一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？碳纤维由主要由碳原子构成的细丝组成，这些原子在微观晶体结构中键合。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Carbon Fiber Is Both Lightweight and Extremely Strong How to cook noodles A maths worksheet

Unlike metals, carbon fiber does not corrode, fatigue easily, or conduct electricity excessively.

Unlike metals, carbon fiber does not corrode, fatigue easily, or conduct electricity excessively.

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用今天的表达，自己说一句。

例子：Unlike metals, carbon fiber does not corrode, fatigue easily, or conduct electricity excessively.