OG13-35麻烦NN分析一下这个句子成分

jeffjarrett

RT.

高中语法不过关的人想分析语法完全无从下手= =

By 1940, the pilot Jacqueline Cochran held seventeen official national and international speeed records, earned at a time when aviation was still so new that many of the planes she flew were of dangerously experimental design.

对于这题的正确选项没有疑问。只是想知道，earned at a time....这个在这句话里的作用是神马？

先谢过啦。

TerraceHo

earned--past participle，是前面speed records的noun modifier，表示sr獲得的時間

kiwifoodtown

同上。