tip root distance [机] 顶根距
As one of key techniques of SNOM, sample tip distance regulation is important and difficult to realize as well.
作为SNOM的关键技术之一，样品与探针间距的控制尤为重要，而实现起来比较困难。
They tip-toed out, through the broken weather-boarding, and stopped at a little distance to exchange a parting word.
他们踮起脚尖，从破木板缝里走了出来，走了一小段路就停下来相互道别。
Try it. Measure the distance from the tip of your head to the floor.
测量一下你们的身高，再用身高除以你们肚脐到地面的距离。
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