demonstratorKK [ˈdɛməˌnstretɚ] ｜ /ˈdɛməˌnstreɪtɚ/
GEPT 中高級
B2noun
a teacher or teacher’s assistant who demonstrates the principles that are being taught
The chemistry professor’s demonstrator showed the class how to safely handle and mix chemicals during the lab session.
（課堂）示範老師；助教
C1noun
someone who demonstrates an article to a prospective buyer
The demonstrator showed how the kitchen gadget worked to the interested buyers.
B2noun
someone who participates in a protest or an organized public display of group feeling
The city was filled with demonstrators marching in protest of the recent policy changes by the government.
示威者；抗議者