Definition
- B2
to perform a specific role, particularly one that is not your usual duty
（通常是臨時的）擔任；擔當；充任
I will act as the temporary leader of the team while the project manager is on leave.
我將在專案經理休假期間擔任團隊的臨時領導人。
The teaching assistant will act as the instructor and teach the students in the professor's absence.
教學助理將在教授缺席時擔任講師並教導學生。
She will act as the MC at the wedding, overseeing the entire ceremony.
她將在婚禮上擔任主持人，負責整個儀式的進行。
to exert a specific influence or result
起作用；发揮效果
This new material can act as an insulator in construction.
這種新材料在建築中可以起到絕緣體的作用。
Some medications can act as pain relievers.
有些藥物可以起到止痛的作用。
Courage can act as a morale booster when facing challenges.
勇氣可以在面對挑戰時起到提升士氣的作用。