2) the fourth defense line
第四道防线
1.
Study on the fourth defense line for Chinese power system;
我国电力系统建立第四道防线的探讨
2.
Several theoretical issues about the construction of the fourth defense line of power system
电力系统建立第四道防线的几个理论问题
3) Three defensive lines
三道防线
1.
Centered in water resources protection, to build three defensive lines (eco-restoration, eco-management and eco-protection) and eco-clean minor watersheds has become the new concept in the minor watershed management in Beijing.
以水源保护为中心，构筑“生态修复、生态治理、生态保护”三道防线，建设生态型清洁小流域的水源保护的思路，是北京市小流域治理的新理念。
4) the second seismic system
第二道抗震防线
5) banker's second line of defence
银行的第二道防线
补充资料：第三
1.复姓。汉田广孙田癸为第三氏。见宋邓名世《古今姓氏书辩证》卷三十。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条