Take a red book or some other brightly coloured object and hold it against the wall.

拿一本红色的数或者其他颜色鲜艳的物体，拿着它对着墙。无论书贴不贴着墙都不碍事。

youdao

Dennis peered into the room and saw her take a small red object out of her briefcase and quickly hide it in the bottom drawer of her dresser.

丹尼斯窥视着房间里的一举一动，只见她从公文包里拿出一个红色的小东西，快速地把它藏在梳妆台最底下的抽屉里。

youdao

Its parent star is a red dwarf--a far smaller and fainter object than the sun.

其母体恒星就像是一个红色的小矮人——比起太阳来实在是又小又模糊。

youdao

They appear red. Light waves from an object speeding toward you will have shorter wavelengths.

VOA: special.2009.04.29

Just place a hot object (a mug of cocoa) on the red side or a cold object (iced coffee) on the blue, then plug in your phone.

ENGADGET

With red and white light, the shadow of the object appears in the complementary color -- cyan -- and the shadows change as your angle of vision changes.

CNN: What the brain draws from: Art and neuroscience

The object of Deltacloud is to open up competition and choice in the cloud market, just as Red Hat Linux did in the hardware market, eliminating the switching cost of investing in a new stack of proprietary offerings and allowing cloud users to invest the savings into conducting application development that truly differentiates them.

FORBES: RedHat CEO Whitehurst: Don't Be Tricked into Cloud-based Lock-in