...单一体（a unified whole）••创造性使用语言（use language creatively）语言知识仅为使用所需（necessary only when needed）多种课程资源（multiple resources）使用交际策略（communicative strategies encouraged）个性化学习（individualized learning...
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The number of genes necessary is also a major limitation, since DNA is most useful when only a single, easily identifiable gene is needed.
所必需的基因数量也是一个主要的限制因素，因为当需一个单一且早已得到证明的基因时DNA非常有用。
By doing so, when megawatts are needed, the plant can synchronize to the grid not only more quickly, but also within the necessary parameters to avoid costly equipment damage.
通过实现以上所述，当需要百万瓦特功率时，电厂不仅可以更快的与电网保持同步，而且还能在必要的参数下避免昂贵的设备损失。
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