Increasing carbon dioxide in the atmosphere has a double effect on coral.
大气中不断上升的二氧化碳含量对珊瑚有双重作用。
Vane pump: vane pump into double effect and single effect vane pump.
叶片泵：分为双效果叶片泵和单效果叶片泵。
This paper introduces the principle and typical operational modes of double effect distillation, and discusses its selection and application.
介绍了双效精馏的原理和几种典型的操作方式，阐明了双效精馏的选择依据和应用原则。
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