2. Geographical lines do exist where true north and magnetic north are aligned, and these are called agonic lines.
当真北和磁北相吻合的时候，确实存在一些被称为无偏线的地理线。
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3. The theory and testing methods for single-mode agonic fiber optic collimator are introduced and some fabrication processes are discussed and compared.
介绍了单模无偏准直器的原理与测试方法，并对一些制作工艺进行了讨论和比较。
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4. The theory and testing methods for single-mode agonic fiber optic collimator are introduced and some fabrication processes are discussed and compared.
