在硬件环境一定的前提下，影响速度的关键因素是并行性。
The key factor which influences speed is parallelism in given hardware environment.
当今有很多并行可视化编程环境，它们都采用不同的可视化模型。
Nowadays there are many parallel visual programming environments which have different parallel visual model.
当今有很多并行可视化编程环境，它们都采用不同的可视化模型。
Nowadays there are many parallel visual programming environments which have different parallel visual model.
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