All the simulations are extensively tested for usability and educational effectiveness, and a rating system is used to indicate what level of testing they have received.

所有模拟的可用性和教育效用都得到广泛的测试，并运用评级系统来显示所达到的测试水平。

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All the simulations are extensively tested for usability and educational effectiveness, and a rating system is used to indicate what level of testing they have received.

所有模拟的可用性和教育效用都得到广泛的测试，并运用评级系统来显示所达到的测试水平。

youdao