red flag

音標(biāo)發(fā)音

The one who carried a red flag walked ahead.
拿著紅旗的那個(gè)人走在前麪。
If you catch someone constantly being dishonest, this is certainly a “red flag” that something is very wrong.
如果你發(fā)現(xiàn)一個(gè)人縂是不誠(chéng)實(shí)，這一定是預(yù)示“情況非常糟糕”的危險(xiǎn)信號(hào)了。
I chanced upon a website with a green and red flag that I’d never seen before, and thought it was about another country.
我偶然瀏覽到一個(gè)印著綠色和紅色旗子的網(wǎng)站，這個(gè)網(wǎng)站我從沒(méi)見(jiàn)過(guò)，我以爲(wèi)它是另外一個(gè)國(guó)家的。

President Hu stood in an open-topped Red Flag limousine to review the troops.
And,so,they proposed a deal, why don't you be king until you croak-- they didn't put it quite like that-- and then the Orleanists will take over with the red, white and blue flag?
於是他們提出一個(gè)交易,你死翹翹之前可以儅國(guó)王--,這不是確切的原話--,然後奧爾良家族掛著紅白藍(lán)三色旗,接手政權(quán)
耶魯公開(kāi)課 - 1871年後的法國(guó)課程節(jié)選
The flag also has thirteen red and white horizontal stripes.

Even for these new, deliberately small sites, a paucity of deals is a red flag, however.
FORBES: Groupon Said To Spawn More Than 180 Clones In U.S. Already

A red flag is a flag that is red in colour and is used as a symbol to represent communism and socialism or to indicate danger or as a sign that you should stop.
If you refer to something as a red flag, you mean that it acts as a danger signal.