The existent questions and progress direction of laser seeker are discussed.
针对目前存在的问题，评述导引头今后的发展趋势和方向。
The existent questions in the crossflow filtration are analyzed as an emphasized portion.
重点分析了错流过滤应用中的问题。
This paper elaborates method solving physics problems by computer, as well as discusses existent questions.
本文阐述了利用计算机解决物理问题的方法，并讨论了存在的问题。
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