count heads的用法和樣例：
例句
用作不及物動(dòng)詞 (vi.)
- The usher was told to look out into the audience and count noses.
引座員被告知要接待好聽(tīng)眾并清點(diǎn)人數。 - The teacher asked Henry to count heads to be sure that no one got lost when we arrived at the top of the hill.
到達山頂以后，老師叫亨利清點(diǎn)人數，以確保沒(méi)有人走失。
