The petroleum hydrocarbon is called hexane.是什么意思？

The petroleum hydrocarbon is called hexane.

己烷是一种石油碳氢化合物.

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。

petroleum

n. 石油；

例句
...Spain's largest distributor of petroleum products...
西班牙最大的石油产品分销商

hydrocarbon

n. <化>碳氢化合物，烃；

例句
It also studied adsorptivity of active carbon on which some of benzene hydrocarbon has been absorbed.
研究了活性炭在已经吸附若干质量的苯类物质以后的吸附性能.

is

vt.& vi. 是（be的三单形式；n. 存在；

例句
Bollinger 'RD' is a rare, highly prized wine.
博林格RD香槟是一种名贵的备受推崇的葡萄酒。

called

v. 叫( call的过去式和过去分词 )，通电话，认为，估计；

例句
He has also called for an acceleration of political reforms.
他同时呼吁加快政治改革的步伐。

hexane

n. （正）己烷；

例句
Acetanilide and hexane diacid, potassium hydrogen phthalate could improve PVC crystallinity.
乙酰苯胺 、 己二酸和邻苯二甲酸氢钾可以使PVC结晶度增大.