Who has seen the creation of the world? It may even be without a beginning, always existing.
谁见过世界的创造？它也许没有开始，一直存在。
Duodenogastric reflux is common clinical phenomenon, always existing the background of abnormal gastrointestinal motility.
十二指肠胃反流是常见的临床现象，往往存在胃肠动力学障碍的基础。
During the manufacturing of the high chrome cast iron ball, the issues like short life time of the ball medium and the unstable performance are always existing.
在高铬铸铁磨球生产上，一直存在磨球介质使用寿命短，性能不稳定的问题。
Abstract: One of the most important factors to depress the accuracy of position tracking is the internal and external uncertainties always existing in the system.
摘要：影响位置跟踪精度最重要的因素之一是系统不可避免地存在内外不确定性。
Abstract: One of the most important factors to depress the accuracy of position tracking is the internal and external uncertainties always existing in the system.
摘要：影响位置跟踪精度最重要的因素之一是系统不可避免地存在内外不确定性。
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