求翻译：这两天给训明发了几个邮件，并发一组井的照片，但是几次都没有成功，不是退信，就是照片没有收到，发出的附件总是不顺畅，这说明，还没有掌握好这一技巧。此外。我试了几次安装网络视频下载，一直没有成功，因此一些视频节目就无法下载保存，这也是一项没有掌握的技巧，还需要学习、摸索。是什么意思？

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This two-day to the Institute made a few mail-ming, who made a group photo of the wells, but few have not been successful, it is not return letter is issued, the annex has not received photographs were not always smooth, and this shows that there is no master this skill. In addition. I tried a few i

These two days for taught Ming Fa several mails, concurrent group of well picture, but several times all have not succeeded, draw back the letter, were the picture have not received, the appendix which sent out are not always smooth, this explained, but also has not grasped this skill.In addition.I

This training were made by the State for two days to a few messages, a group of photos, but several times without success, was not returned, is the photo did not receive, attachments are always issued is not smooth, it means, there is no master this technique. In addition. I've tried several times t