高压直流架空线路和地下线路分段的组合也常采用.Combinations of both overhead and under - ground HVDC line segments frequently occur.介绍一种电力机车带电通过相分段的自动转换系统.This paper introduces an automatic conversion system for locomotive pas sing through the ...
In winter bears usually hibernate in their dens.冬天熊通常在穴里冬眠....the crack dens of urban America.美国城市中的可卡因毒窟I could provide you with the addresses of at least three illegal drinking dens.我可以为你提供至少 3 处非法饮酒窝点的地址。Female bears ...
Snipers and irregulars fell on the hapless patrol.狙击兵和非正规军袭击了巡逻队.For war reporters, dodging snipers' bullets is all in a day's work...对于战地记者来说，躲避狙击手的子弹是家常便饭。It is commonplace for snipers to open fire on aid con...