roof

英[ruːf] 美[ruf]

反义词floor

复数: roofs;第三人称单数: roofs;过去式: roofed;过去分词: roofed;现在分词: roofing;

roof 顶部，屋顶

来自古英语 hrof,屋顶，天花板，天空。

roof: roof: [OE] The antecedents of roof are far from clear. Its only surviving relative seems to be Dutch roef ‘cabin, coffin lid’, and although it also had links with Old Norse hróf ‘boat-shed’, its ultimate origins remain a mystery.
roof (n.): Old English hrof "roof, ceiling, top, summit; heaven, sky," also figuratively, "highest point of something," from Proto-Germanic *khrofam (cognates: Old Frisian rhoof "roof," Middle Dutch roof, rouf "cover, roof," Dutch roef "deckhouse, cabin, coffin-lid," Middle High German rof "penthouse," Old Norse hrof "boat shed").

No apparent connections outside Germanic. "English alone has retained the word in a general sense, for which the other languages use forms corresponding to OE. þæc thatch" [OED]. Roof of the mouth is from late Old English. Raise the roof "create an uproar" is attested from 1860, originally in U.S. Southern dialect.
roof (v.): early 15c., from roof (n.). Related: Roofed; roofing.

2. Water tanks should be well lagged and the roof well insulated.: 水箱和屋顶都需要敷设严密的保温层。

3. Goldsmith has repaired the roof to ensure the house is wind-proof.: 戈德史密斯修理了屋顶，以确保房屋能够抗风。

4. Mills have iron pillars all over the place holding up the roof.: 工厂里四处都立有铁柱支撑着房顶。