The letters N, S, E and W stand for north, south, east and west.

字母N、S、E和W分别代表北、南、东和西。

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It takes an emergency vehicle an average of 15 seconds to go one block in the N-S direction and 20 seconds in the E-W direction.

应急车辆驶过一条南北向的街道平均要花15秒，而通过一条东西向的街道平均要花20秒。

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The results showed as follows: There are significant differences in N-S direction of different variety communities in PAR distribution and interception, while there is similarity in E-W direction.

结果表明：不同穗型品种在东西行向上，光截获和分布差异不大，在南北行向上差异明显。

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