飞行员用一种叫做视速仪的仪器，它能在飞行员眼前快速地闪过敌机。
Pilots used a pacing tool called a tachistoscope that flashed images before their eyes at increasing speeds.
本文指出了福建微震仪地震台网在地震速报和编目工作中存在的主要问题以及问题产生的可能原因；
The paper pointed out the major problems and their generating reasons in the work of earthquake rapid report and seismic catalogue organizing of Fujian microseismic network.
用颗粒动态分析仪(PDA)测量了悬浮床内气固两相流动的结构，确定了不同表观气速和不同进气结构条件下的两相流场的特点。
The structures of the gas solid two phase flow in the suspension bed were measured by a particle dynamic analyzer (PDA) at different apparent velocities for each of the nozzle structures.
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