And at a time when prices are rising quickly one should think long and hard about these questions. 同时,若价格在迅速上涨,就更要三思,慎重考虑这些问题。
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. 而且，当世界能源价格剧烈波动，当许多大型的石油和天然气的出口国由于担忧而变得民族主义，保护国内能源已变得尤为重要。
Is there a time when the conference room is free? 会议室有空著的时候吗?
I will come at a time when you are at home . 你在家的时候我会来。