1·Pure air is colourless and odourless.
纯空气是无色无臭的。
—— 《新英汉大辞典》
2·Instead of the colourless air of the uplands the atmosphere down there was a deep blue.
这儿和高地无色的空气不同，在山谷里，那儿的大气是一种深蓝色。
3·The odourless, colourless gas is deadly if there is high or prolonged exposure.
这种无色无味的气体如果长期大量地泄露，将是杀人不眨眼的恶魔。
4·Displacement usually occurs in such a way that a colourless and abstract expression of the dream - thought is exchanged for one that is pictorial and concrete.
置换的结果通常使梦念中一个无色、抽像的概念改变为图画或者是具体的形像。
5·SO2 is a colourless gas with a sharp odour.
二氧化硫是一种无色气体，带有刺鼻的气味。