一个数学论文摘要的翻译问题

本文利用Lebesgue测度的等测内包和等测外包讨论了内外测度的一系列性质。给出了内外测度具有有限可加的一个充要条件，改进了原有有限可加性相关问题的结果。
By using Lebesgue measure of measurement, such as in-house and outsourced, such as measuring discussed the nature of a series of internal and external measures. Given the internal and external measures may have limited the increase necessary and sufficient condition to improve the original may be limited and the results of related issues.