a time when prices escalate的用法和样例：
- The move is a sign of appetite for physical commodities at a time when prices have started rising again after falls last year.
- And secure domestic sources of energy are particularly prized at a time when prices are volatile and many of the big oil and gas exporters are becoming worryingly nationalistic.
- Is there a time when the conference room is free?
- I will come at a time when you are at home .