Second, you can have a deep breathing before you start a test.
第二，你可以在开始考试前深呼吸。
Through ground test and hypersonic flow research, he made great progress in air-breathing hypersonic technology.
通过地面试验和高超声速非平衡流的研究，取得了再入突防气动物理的重要进展。
Through ground test and hypersonic flow research, he made great progress in air-breathing hypersonic technology.
通过地面试验和高超声速非平衡流的研究，取得了再入突防气动物理的重要进展。
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