对LT5米模型下的舱索系统进行了优化，根据优化结果改造了LT5米模型，通过实验进一步验证了优化结果的正确性。
The LT5m model is changed after the optimization of it, which further confirms the validity of the optimal results by a lot of experiments.
它大约有三米长，开发这个模型花了大约四年的时间。
It's about three meters long, and it took about four years to develop the model.
米拉及其合作者指出，这些早期模型确实有些严重的局限性。
Mira and co point out that these early models had some serious limitations.
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