触变性：活版及柯式油墨的一种特性。当搅拌后，油墨变得稀，但让它静止一段时间，它又变回半固体状态的情况。
Thixotropy: The property of letterpress and offset inks of becoming fluid when stirred and setting to a semi solid state when left at rest for some times.
指针会振荡一段时间然后才静止到一个稳定的偏转角。
The pointer oscillates for some time before setting down to a steady deflection.
尽管已经有很多方式用于测量大脑灌注，包括PET、SPECT、氙ct和TCD，但是这些要求患者较长一段时间保持静止。
Although various methods have been used to measure cerebral perfusion including PET, SPECT, xenon CT, and TCD, these require the patients to remain still for a long period.
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