direct liquefaction

例句：

1. 1. The process of direct liquefaction is crucial for the production of high-quality steel.
   直接液化过程对于生产高质量钢材至关重要。
2. 2. During the direct liquefaction process, the water and coal are mixed and heated to a high temperature, causing the coal particles to break down into smaller pieces.
   在直接液化过程中，水和煤被混合并加热至高温，使煤颗粒分解成更小的碎片。
3. 3. The direct liquefaction technology has been widely used in the production of clean energy, such as windpower and solar power.
   直接液化技术已被广泛应用于清洁能源的生产，如风能和太阳能。