At what age do babies start to recognize that they are active agents?
婴儿什么时候开始认识到他们有主动影响力？
In fact, most of the heavy metal chlorides could not be used as active agents.
实际上，大多数重金属氯化物不能作为活性剂。
The market has improved and the agents are more active.
由于市场得到了改善，代理商变得更加活跃。
Agents controlling the metamorphism: temperature, pressure and chemically active fluid.
作用控制因素：温度、压力和化学活动性流体。
Agents controlling the metamorphism: temperature, pressure and chemically active fluid.
作用控制因素：温度、压力和化学活动性流体。
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