But the inaccessibility of doctors makes early detection more difficult.
但是，看医生难让早发现更加困难。
After water is carried in gas Wells, status of fluid flow and medium distribution become more complicated, its production performance detection will be more difficult.
气井出现载水现象后，井筒中流体的流动状态和介质分布将变得复杂，其生产动态监测更为困难。
With more and more use of Inverter in oil pipeline transportation, pipeline transportation becomes non-stationary and pipeline leak detection goes more difficult.
实际中原油管道越来越多采用变频输送，这样很容易造成管道的非平稳运输，增加了管道泄漏检测的难度。
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