1) replacement heifer
后备牛
1.
The period of replacement heifers is the key stage of dairy raising .
后备牛时期是奶牛养殖的关键阶段。
3) Backup
[英]['bæk,ʌp] [美]['bæk,ʌp]
后备
1.
Taking the 75 t/h boiler control system as an example,some problems relating to the PLC-5 backup communication technique were stated in detail,such as the hardware installation .
详细地阐述了与ＰＬＣ－５的硬件安装、后备系统工作流程、软件设计及后备程序调试等有关的后备技术问题，从而有效地避免了ＰＬＣ硬件系统故障造成的控制过程中断，实现了利用后备（冗余）通讯技术，进行连续，不间断的过程控制。
2.
The paper introduced a case of main transformer backup protection tripping and analyzed problems in the accident.
针对一起主变后备保护跳闸,由于运行人员处理不当,造成事故扩大的原因进行分析,并就暴露的问题展开深入分析研讨,制定出相关问题的防范措施。
4) backup
[英]['bæk,ʌp] [美]['bæk,ʌp]
后援,后备
5) backup equipment
后备设备
补充资料：有牛使牛﹐无牛使犊
1.比喻当达不到原有条件时﹐则降格以求。
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