精华液的英文：
essence
serum

essence是什么意思：
n. 本质，精髓；精华液

synthetic essence
合成香精

strawberry essence
草莓香精

In essence, all computers are the same.
所有的电脑其实都一样。

Its essence is a discipline of verification.
其本质上是一门查证核实的学问。

The essence of language is communication.
语言的本质是沟通。

serum是什么意思：
n. （免疫）血清；浆液

serum cholinesterase activity
血液胆碱脂酶活性

Therapeutic serum levels remain undefined.
治疗血药浓度尚无定论。

When was the last time you took the serum?
你上一次注射血清是什么时候？

The serum comes from a tropical plant.
这种浆液产自一种热带植物。

The only available hyperimmune serum was of equine origin
唯一可得到的超免疫血清来源于马。