油气再混合成样比较复杂。

The preparation of a recombination sample is more complex.

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蜂胶是蜜蜂用植物汁液合成的像树脂一样的坚硬物质。

Propolis is a hard resinous substance made by bees from the juices of plants.

《柯林斯英汉双解大词典》

多年来研究者们一直致力于开发一种与猫眼石一样有散射特性的合成材料，他们在各种各样的材料中蚀刻图案，但是都无功而返。

For many years researchers have been trying to develop a synthetic material with the same light-scattering properties as an opal, by etching patterns into various materials. That approach has failed.

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