尤其是定向越野跑的技术训练，必须在野外进行，学校的操场是不可能代替的。

Directional technology of cross-country running train especially, must go on in field, school it is impossible for playground to replace.

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地下水监测的数据采集工作全部都是在野外进行的，所以需要性能出色，移动性好，待机时间长的电脑。

Because data acquisition of groundwater monitoring is completely carried on in the field, it needs computer of excellent performance, good mobility and working for a long time.

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因此，洒水车的三通滤网的滤芯是需要定期进行清洗的，特别是经常在野外进行取水的车辆，更应加大清理频率。

Therefore, the three pass filter of the filter is the need for regular cleaning of the filter, especially in the field of vehicles often carried water, but should increase the frequency of cleaning.

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