尽管很困难，但这种混合物可以分解为不同的成分。

This mixture can be separated into its different components (成分) although it is very difficult.

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油画颜料在十五世纪取代蛋彩的时候, 画家开始能够处理一些诸如人像画等困难的题材, 因为不象蛋彩,油画颜料可以混合和覆盖.

When oil paint replaced tempera in the fifteenth century, it helped painters to deal with difficult subjects like the human figure because, unlike tempera, oil can be blended and overpainted.

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正常情况下，这种一步混合难以成功，因为使两种液体稳定地流过一个通道十分困难。

Normally, this sort of single-step mixing would not work, because of the difficulty of getting two liquids to flow stably through one channel.

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