【英语时差8,16】撕纸的科学

 The way paper tears is related directly to how it is made. Most paper is made from wood fibers¹. Logs are chopped into wood chips, mixed with water and chemicals, and run through a process that separates the wood fibers. The soupy mush that results is called pulp². The pulp is pressed onto a mesh³ conveyor belt that squeezes the water out. As the pulp moves along the belt the wood fibers line up in the direction of the belt’s travel. This alignment⁴ of the fibers on the belt gives the paper a grain. This grain is what causes the paper to tear straighter one way than the other. When paper is ripped with the grain the tear goes with the direction of the fibers, and is fairly straight. When you tear the paper across the grain the tear tends to wander as it works against the direction of the fibers.

 

1 fibers   

光纤( fiber的名词复数 )； （织物的）质地； 纤维，纤维物质

参考例句：

• Thesolution of collagen-PVA was wet spined with the sodium sulfate as coagulant and collagen-PVA composite fibers were prepared. 在此基础上，以硫酸钠为凝固剂，对胶原-PVA共混溶液进行湿法纺丝，制备了胶原-PVA复合纤维。
• Sympathetic fibers are distributed to all regions of the heart. 交感神经纤维分布于心脏的所有部分。

2 pulp   

n.果肉，纸浆；v.化成纸浆，除去...果肉，制成纸浆

参考例句：

• The pulp of this watermelon is too spongy.这西瓜瓤儿太肉了。
• The company manufactures pulp and paper products.这个公司制造纸浆和纸产品。

3 mesh   

n.网孔，网丝，陷阱；vt.以网捕捉，啮合，匹配；vi.适合； [计算机]网络

参考例句：

• Their characters just don't mesh.他们的性格就是合不来。
• This is the net having half inch mesh.这是有半英寸网眼的网。

4 alignment   

n.队列；结盟，联合

参考例句：

• The church should have no political alignment.教会不应与政治结盟。
• Britain formed a close alignment with Egypt in the last century.英国在上个世纪与埃及结成了紧密的联盟。