Menthol was obtained from lemon eucalyptus oil via cyclization and catalytic hydrogenation.是什么意思？

Menthol was obtained from lemon eucalyptus oil via cyclization and catalytic hydrogenation.

以柠檬桉叶油为主要原料经环化、催化氢化二步反应得到薄荷醇.

menthol

n. 薄荷醇，薄荷脑；

例句
Inhalations of menthol may do the trick.
吸入薄荷醇或许可以起到作用。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

obtained

v. 获得( obtain的过去式和过去分词 )，买到，（规则、制度、习俗等）存在，流

例句
I had obtained the authentic details about the birth of the organization.
我已经掌握了有关该组织诞生的可靠的详细资料。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

lemon

n. 柠檬，柠檬树，柠檬黄；adj. 柠檬色的；

例句
Boil the chick peas, add garlic and lemon juice...
把鹰嘴豆放在开水中煮，并加入大蒜和柠檬汁。

eucalyptus

n. 桉树，桉属植物；

例句
Menthol was obtained from lemon eucalyptus oil via cyclization and catalytic hydrogenation.
以柠檬桉叶油为主要原料经环化、催化氢化二步反应得到薄荷醇.

oil

n. 油，石油，油画，燃油；vt. 给…加油；vi. 化成油；

例句
Several magnificent oil paintings adorn the walls.
几幅恢宏的油画装点着墙面。

via

prep. 经过，通过，凭借，取道；

例句
Access was via a narrow archway.
通道入口是一道狭窄的拱门。

cyclization

n. 环化（作用），成环；

例句
Levocetirizine Dihydrochloride was prepared from benzoyl chloride by acidylation, hydrogenation, cyclization with an overall yield of 8.05 %.
以苯甲酰氯为原料,经酰化, 还原, 环合等反应合成左旋西替利嗪盐酸盐,反应总收率为8.05%.

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。

catalytic

adj. 接触反应的，起催化作用的；n. 催化剂，刺激因素；

例句
...carbon molecules with unusual chemical and catalytic properties.
具有特殊化学性质和催化性的碳分子

hydrogenation

n. 加氢，氢化（作用）；

例句
The said catalyst was a good hydrogenation catalyst for adiponitrile.
Ni-Al-X 催化剂是己二腈加氢的优良催化剂.