(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
发挥
fā huīㄈㄚ ㄏㄨㄟ
to display; to exhibit; to bring out implicit or innate qualities; to express (a thought or moral); to develop (an idea); to elaborate (on a theme)[cedict]
作用
zuò yòngㄗㄨㄛˋ ㄩㄥˋ
to act on; to affect; action; function; activity; impact; result; effect; purpose; intent; to play a role; corresponds to English -ity, -ism, -ization[cedict]