介绍旋转薄膜蒸发器的结构与性能。讨论了原有设备及流程的不足，以及为解决这些不足而开发出的新型设备与流程。
Structure and characteristics of rotating film-evaporator are introduced, its new type and technological process have been developed to remedy the defects of the original type and flow sheet.
鉴于这些相互矛盾的目标，粮食危机产生了对主要问题的相反考虑和完全不同的解决办法，这是不足为奇的。
Given these conflicting aims, it is not surprising that the food crisis has produced contradictory accounts of the main problem and radically different proposals for solving it.
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