Each picture is shown in colour on one page and as a bold outline on the opposite page.

每幅画在一页上是彩色的，在相对的一页上则是清晰刚劲的轮廓。

《柯林斯英汉双解大词典》

You can see the bold outline of the mountain against the blue sky.

你可以看到在蓝天衬托下山脉的清晰轮廓。

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With its bold outline and wonderful colourful rich tone quality, it was the perfect concert violin for him.

这把小提琴轮廓厚重，音色丰富多彩，简直是他最完美的音乐会用琴。

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For such an elaborate tattoo to last, a simple and bold design in black outline goes a long way, he said.

CNN: A tattoo artist's take on summertime body art

Public Advocate Bill de Blasio, said the mayor is "out of touch" and didn't outline any bold ideas to tackle the city's knottiest problems.

WSJ: Mayor Celebrates His Achievements