那么如果过一段时间,这就有一个向量△,它是位矢经过一段时间的改变量。
r So, if we wait a certain amount of time, we'll have a vector, delta r, which is the change in position vector a various interval of time.
轴位图像与深脑裂难以鉴别,但是矢状位可以显示出典型的改变。
Axial MR images can be confused with schizencephaly, but sagittal images show typical findings.
图5:矢状位颈胸椎T1序列显示蛛网膜下腔多发的点状高信号影,提示来源于破裂的皮样囊肿所致的脂肪沉积。
Figure 5: Sagittal T1W image of the cervicodorsal spine shows multiple hyperintense foci in the subarachnoid space suggestive of fat deposition from dermoid rupture (arrows).
You can actually take derivatives of a vector with time.
你可以直接求位矢对时间的导数
More position vectors? I want to look at that.
例如其它的位矢,我想来看一下
That's the analog of the position vector.
那是和位矢相似的情况
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