flask
noun [ C ] uk/flɑːsk/ us/flæsk/
(HOT DRINKS)
UK (US trademark Thermos)保温瓶
a special container that keeps drinks hot or cold
a flask of coffee/tea 一保温瓶的咖啡／茶
(ALCOHOL)
（装于口袋里的）扁酒瓶
a flat bottle that is used to carry alcohol in your pocket
a hip flask 随身小扁酒瓶
(SCIENCE)
长颈瓶;烧瓶
a glass container for liquids with a wide base and a narrow neck, used in scientific work