She accidentally swallowed the poison and death was instantaneous.

她意外地吞下了毒药, 当即就死去了。

He had an instantaneous response.

他立刻作了反应。

ROLL is the instantaneous value of the angle between the reference plane and the horizontal, measured in an athwartship vertical plane.

横左到右通过舰身的垂直面，量度参考面与水平面之间所形的即时角度。

Calculation of the instantaneous heat performance on windshield surface is the important content of design of hot-gas anti-fogging and defogging system.

摘要风挡表面瞬态热特性计算是热空气射流（）系统设计的重要内容。

Weighing filtration membrane is often used to get the dust concentration of environment.However,this method is discommodious and can not get the instantaneous transformation of dust concentration.

环境粉尘浓度的测定一般使用滤膜称重方法测得,该方法费时费力,且不能得到瞬时粉尘浓度的变化。