潮汐、风暴潮对波浪的作用是通过其产生的不定常水深与流场实现的；水深与流速对波向的影响很小。
The sea level and current velocity have an effect on wave height, and the wave direction modulation is small.
离心式污水泵(即污水提升泵)，是典型的以输送固液两相流为主，同时含有不定量气体的多相流流体机械。
The centrifugal sewage pump is the typical multi-phase flow fluid machinery, which is mainly used to transport and lift solid-liquid two-phase flow including a certain extent of gas.
黄河河口流路是决定油港港址的关键，尽管有河口流路安排这个不定因素。
The key of the question is that the site of oil dock is determined by the flow couorse at the estuary of Yellow River.
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