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。
2
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 cedarwoodoil 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。
3
In order to improve the odour quality of cedarwoodoil, the water distillation (over water boiler) should be replaced by steam distillation.