The carbonization and the graphitization of PI filament were described.是什么意思？

The carbonization and the graphitization of PI filament were described.

叙述了PI原丝的碳化和石墨化过程.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

carbonization

n. 碳化，干馏，碳化物，炭化；

例句
The degree of carbonization of coal depends on the temperature.
煤层的炭化程度取决于温度.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

graphitization

n. 石墨化；

例句
The carbonization and the graphitization of PI filament were described.
叙述了PI原丝的碳化和石墨化过程.

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

filament

n. [印，纺]长丝，单纤维，[电]灯丝，丝极，游丝，细丝，丝状体，[植]（雄蕊的）花丝；

例句
The staminal filament of feverfew is detached, antheral combination, say to get together medicine is staminal.
菊科植物的雄蕊花丝分离, 花药联合, 称聚药雄蕊.

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

described

adj. 被看到的，被发现的；v. 描写( describe的过去式和过去分词 )，叙述，画出（图形等），形容；

例句
The President described the killings as an abominable crime...
总统称这些血案为令人发指的罪行。