The navigable small-scale ship model is widely used in studying harbour and inland river navigable conditions and similarity is the key point.
通航小尺度船模在港口及内河通航模拟研究中得到了广泛的应用，而相似问题是小尺度船模研究的重要环节。
There are truly an immense number of small items on the full - scale ship that cannot be represented at model scale.
在模型上不能表征的真实飞机上的细小项目实在太多了。
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