These front-line defences are backed up by armoured units in reserve.
前线防御有后备装甲部队的支援。
《柯林斯英汉双解大词典》
2
Under one model the insurance pool would function like a reserve fund, offering participants a short-term credit line they could call upon during a crisis.
在一种模式下，保险库可起到储备基金的作用，为参与者提供短期信贷，在危机到来时便可向其求助。
3
The major U.S. investment Banks merged, failed, or sought a life-line from the Federal Reserve as newly converted bank holding companies.