For highly colored wood such as mahogany and red cedar, oil and alcohol stains sealer of the most effective.
对于着色性很强的木料，如桃花心木和红杉，油性和醇性污渍封闭底漆最有效。
Some of them come first on the list in the world, such as cassia oil, star anise, peppermint oil, menthol, turpentine oil, eucalyptus oil and cedar wood oil etc.
其中，如桂油、八角茴香、薄荷油、薄荷脑、桉叶油、松节油、柏木油等的产量已居世界前列或首位。
In order to improve the odour quality of cedar wood oil, the water distillation (over water boiler) should be replaced by steam distillation.
为改进柏木油香气质量，主张以水蒸汽蒸馏技术取代水上蒸馏法，不赞成用干馏法或“红锅”法来制取柏木原油。
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