血清張力素

serotonin

blood / colloquial pr. [xie3] / CL:滴[di1],片[pian4]

serum / blood serum

Qing (Wade-Giles: Ch'ing) dynasty of imperial China (1644-1911) / surname Qing

clear / distinct / quiet / just and honest / pure / to settle or clear up / to clean up or purge

(of water etc) clear; clean / quiet; still / pure; uncorrupted / clear; distinct / to clear; to settle (accounts)

surname Zhang

to open up / to spread / sheet of paper / classifier for flat objects, sheet / classifier for votes

tension

power / force / strength / ability / strenuously

raw silk / white / plain, unadorned / vegetarian (food) / essence / nature / element / constituent / usually / always / ever