Figurant
n. [芭蕾]男配角演員,(戲劇電影中的)群眾演員
??? 情景例句
I don't know.
我不知道。
How much should people demand of their governments?
國民對其政府應該要求多少呢？
So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.
從測定海深到測定魚群，這一進展比較容易。