A "banner" is a long strip of cloth with writing on it, often carried on poles during protests or rallies. It can also be used in the phrase "under the banner of" to signify support for a cause or belief.
[N-COUNT 可数名词]（通常指在抗议或集会中用两根竿子撑开的）横幅，标语 A banner is a long strip of cloth with something written on it. Banners are usually attached to two poles and carried during a protest or rally.
...a large crowd of students carrying banners denouncing the government...
一大群高举谴责政府的条幅的学生
A big banner was draped across one of the streets saying, 'Idaho Falls Says NO to Drugs.'
一条写有“爱达荷福尔斯市拒绝毒品”的大横幅悬跨其中一条街道。
2
[PHRASE 短语]在…的旗帜下；为了…的事业（或信仰） If someone does something under the banner of a particular cause, idea, or belief, they do it saying that they support that cause, idea, or belief.
[PHR n]
All countries march as one nation under the banner of friendship.
所有国家在友谊的旗帜下团结一致，共同前进。
Under the banner of education, we herd our children from ballet to basketball and back again.
打着教育的旗号，我们赶鸭子上架似的让孩子从芭蕾到篮球，不停地学这个学那个。
Oxford
ban·ner/ˈbænə(r); NAmEˈbænər/nouna long piece of cloth with a message on it that is carried between two poles or hung in a public place to show support for sth 横幅；旗幡◆Protesters carried a banner reading ‘Save our Wildlife’.抗议者打着“救救我们的野生生物”字样的横幅。bannerbannersban·ner/ˈbænə(r); NAmEˈbænər/
LDC
bannerban‧ner /ˈbænə $ -ər/ ●●○ noun [countable]
Word Origin
Examples
Collocations
Phrases
1a long piece of cloth on which something is written, often carried between two poles: The onlookers were shouting, cheering, and waving banners.2a belief or principlecarry/raise/wave etc the banner of something (=publicly support a particular belief etc) She’d never felt the need to carry the banner of feminism.under the banner of something They marched under the banner of equal educational opportunity.3 under the banner of something as part of a particular group or organization: The oil-producing countries joined together under the banner of OPEC.4a flag