单词：testing ground
testing ground的用法和样例：
例句
- It's an ideal proving ground for the new car.这里是个理想的新车试验场。
- Delmar Simpson and Nathanael Beech were arraigned Friday at the Aberdeen Proving Ground Military Base in Maryland.德尔玛辛普森和拿比奇被传讯星期五在阿伯丁试验场军事基地马里兰。
- laboratory实验室
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英文语法词汇