vacuum n. (pl. vacuums, vac-ua ) 1.真空;空處,空虛,空白。 2.〔美口〕吸塵器(= vacuum cleaner)。 a low [partial] vacuum低度[未盡]真空。 feel a vacuum in the lower regions 〔戲謔語〕覺得餓。 vi.,vt. 〔美口〕 1.用吸塵器掃除。 2.用真空干燥機干燥。 adj. 1.真空的。 2.用以產生真空的。 3.利用真空的。 vt. -ize 1.在…內造成真空。 2.用真空裝置打掃[干燥]。 3.真空包裝。
flask with double walls separated by vacuum; used to maintain substances at high or low temperatures 同義詞:vacuum bottle,
百科解釋
A vacuum flask (also known as a Dewar flask, Dewar bottle or Thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two [placed one within the other and joined at the neck.