•Water and glass are colourless.水和玻璃是无色的。

•Carbon monoxide is a colourless, odourless, poisonous gas.一氧化碳是一种无色、无味的有毒气体。

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•It is a rather grey, colourless city, with few interesting sights.这是一个灰暗、了无生趣的城市，有趣的景点寥寥无几。