• 1. free fall drop: 自由落体坠击 | 自由跌落 | 落下试验机
• 2. free-fall drop test: 下落试

• 1.The basic principle of simple high strain pile test method transformed from measured free fall of drop hammer is given in this paper.
  给出测量自由落锤的加速度换算高应变试桩的动力的简易法的基本原理、测试操作与工程应用。
  dict.yoduao.com
• 2.One more drop of challenge, our confidence level is going to free-fall to the end-point...
  再滴加一滴挑战，置信度就会以自由落体之势坠入滴定终点。
  dict.yoduao.com

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