But, on smelling them, he found that they were odourless.

但是当他闻了一下之后，却发现这些紫萝兰半点香味也没有。

The last culprit you need to know about is Carbon Monoxide. It is an odourless, colourless and extremely poisonous gas.

你需要知道的最后一个罪魁祸首是一氧化碳。它是一种无味、无色的剧毒气体。

During extensive tests, one subject requested “the perfect drink”, and was given an odourless, lavender-coloured liquid.

在广泛的测试中， 一名受试者要求“完美的饮料”，并获得了一种无味、淡紫色的液体。

Odourless and deadly, carbon monoxide could quickly poison many miners before they even knew what was happening.

一氧化碳无味且致命，可以在许多矿工还不知道发生了什么事之前迅速使他们中毒。

Dr Gallup daubed an odourless mark on the face of his subjects and waited to see how they would react when they saw their reflection.

盖洛普博士在受试者的脸上涂抹了一个无味的标记，然后观察他们看到自己的倒影时会有什么反应。

Each insect was placed for five minutes in an apparatus that had two chambers, one of which contained a sample of the volatiles and the other an odourless control.

每只昆虫都被放置在一个两室装置内五分钟，一个腔室内含有挥发性物质的样本，另一个则毫无气味，以此作为实验对照。