Creative ideas not only produce their own instruments of survival as time and circumstances demand, but permit the substitution of new forms for old under the pressure of changed circumstances.
创造性的思想不仅随着时间和环境的需要产生自己的生存工具,而且允许在已变化环境的压力下用新的形式代替旧的形式。
Begin-as circumstances demand-with the economy.
正如形势需要,先从经济入手。
In a number of key areas the circumstances demand policy adaptations.
形势要求在几个关键领域进行政策调整。