（9） Once in a blue moon 偶尔为之：

　　For lack of leisure, some working people went shopping once in a blue moon.

　　（10） Disappear/Vanish into the blue 突然消失：

　　A bird was standing on a window sill. All at once, if flew away and disappeared into the blue.

　　（11） Give greenlight to 批准做：

　　The authorities have given our department the greenlight to purchase the equipment required.

　　（12） Green with envy 非常妒忌：

　　On hearing about Cathys promotion, Jane is green with envy.

　　（13） Catch red-handed 当场被捕：

　　The shop-lifter stole something valuable and was caught red-handed.

　　（14） Roll out the red carpet 隆重欢迎：

　　When a foreign dignitary comes to visit the country, the government often rolls out the red carpet for him.

　　（15） Cut the red tape 取消繁文缛节：

　　If the authorities concerned can cut the red tape, a lot of work can be more quickly done.

　　（16） See red 突然发怒：

　　When Mrs Lin entered the guest room, it was in a mess; she saw red and scolded the maid for not tidying it up

　　（17） Turn as white as a sheet 脸色变得很苍白：

　　When the car driver received a traffic polices summons, he turned as white as a sheet.

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