One can now understand the reason: red that day, and that night.

现在也可懂得其中道理了：红表示白天，黑表示夜晚。 。

youdao

It had long been thought that hummingbirds, which forage by day, pollinate its red flowers and that hawkmoths, which forage at night, pollinate its white flowers.

长期以来，人们一直认为，白天觅食的蜂鸟会给它的红色花朵授粉，而晚上觅食的鹰蛾会给它的白色花朵授粉。

youdao

In the entrance foyer, next to a fizzy-drinks machine, sits a red kiosk that rents films by the day.

在入口大厅里，有个红色的售货亭伫在自动饮料贩售机旁，它可以按天出租电影。

youdao

I've heard that there is a very special day called "Red Nose Day" in England.

我听说英国有一个特殊的日子叫做“红鼻子日”。

英国的慈善事业 - SpeakingMax英语口语达人

But that isn't the only thing that is in three weeks, as the first decent title for the red camp also comes out that day in the way of American Gangster.

ENGADGET: HD DVD and Blu-ray releases on January 29th, 2008 HD

You can host a Wear Red Day event on any day during February that works for you.

FORBES: Mark Your Calendars for Wear Red Day On February 4th

That decision was clear-cut, but Hibs strongly disputed the red card that completed Bamba's miserable day, although it looked like the defender was the last man as he tripped the rampaging Nade 25 yards from goal.

BBC: Hibernian 1-0 Hearts