通过分析，阐述了直流牵引变电所内的整流器不必设置逆流保护的理由。
The reasons why reverse current protection is not necessary in rectifiers of direct current traction substation are described.
海藻紧贴并保护胃粘膜，而且浮在胃内容物上面，就像“木筏”一样将胃内容物平静下来并阻止逆流。
The seaweed coats and protects the stomach lining but also floats on top of the stomach contents, acting as a "raft" to calm things down and stop reflux.
海藻紧贴并保护胃粘膜，而且浮在胃内容物上面，就像“木筏”一样将胃内容物平静下来并阻止逆流。
The seaweed coats and protects the stomach lining but also floats on top of the stomach contents, acting as a "raft" to calm things down and stop reflux.
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