... 地面试验设备 ground test equipment; ground testing facility; ground-testing plant 地面试验样品 ground test example 地面试验装置 ground-testing-piston ...
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ground test example
地面试验实例
以上为机器翻译结果，长、整句建议使用 人工翻译 。
So Douglass especially promoted, championed his interracial friendship as a kind of test case, on-the-ground example of how democracy could work, and in his hope, an inspiration for others in the United States.
NPR: Lincoln and Douglass Shared Uncommon Bond
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