当映射数量很少时，您可以在消息流中使用路由或过滤器，但是随着消息流所用映射数量的增加，使用这个方法的难度也在增加。

When the number of maps is low, you can use routing or filter nodes in the message flow, but this method becomes increasingly difficult as the number of maps used by the message flow increases.

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当氮或磷或两者存在数量很少时，不出现这种藻花。

Such blooms do not occur when nitrogen or phosphorus or both are present in very limited amounts .

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另外，夫妻双方各自应该花多少时间在工作和家庭上面、夫妻应该有多少时间在一起或独处，也都是讨论得很少的事情。

There was also little discussion about the amount of time each would spend at work or at home, or how much time they expected to spend together and apart.

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