有了适当的工具支持，设计人员可以在高层的系统模型上进行执行或模拟，并调试，从而在早期确认并验证系统逻辑。
With appropriate tool support, designers could perform execution or simulation and debugging on high-level system models to validate and verify system logic early on.
这意味着模拟可以在设计的早期阶段执行。
This means that the simulations can be executed at very early stages of design.
为了模拟视网膜发育的早期阶段，研究人员需要构建出浓度梯度差异极其细微的溶液来培养细胞以使它们向不同的途径分化。
To mimic early stage retinal development, the researchers needed to build microscopic gradients for solutions in which to bathe the stem cells to initiate specific differentiation paths.
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