method of natural drying 自然干燥法
So the critical point drying method is better than the natural drying method for palynology research.
进行孢粉学研究，临界点干燥法优于自然干燥法。
Ouerya piano wood use the natural drying, artificial drying and thermal insulation method to guarantee the tone exactitude.
钢琴木材性能稳定。欧尔雅钢琴木料使用天然干燥、人工干燥和保温处理的方法确保钢琴发音的精确性。
Oily sludge is an major pollution source during the development of oilfield. Natural drying and burial method have been mainly adopted for the oily sludge in Gudong oilfield at present.
含油污泥是油田开发过程中的重要污染源，孤东油田目前对含油污泥主要采用自然干化填埋处理法。
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