I already used this technique above in the split call, which matched the null string (it matches everywhere, so all the characters in the matched string are returned individually).
在split调用中我们就已经使用了这种技术，它可以匹配空字符串(它可以匹配任何地方，因此所匹配的字符串中的所有字符都会一个一个地返回)。
The system's frequency stability and target's Doppler effect, which mainly influence high range resolution technique, were also analyzed. The first null velocity was calculated.
对影响该高距离分辨率技术的系统频率稳定度和目标多普勒响应进行了分析，计算出目标第一零值点速度。
Automatic null-tracking technique overcomes slow system drift.
用自动零跟踪技术克服系统的缓慢漂移。
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