求翻译：网络学习优点是方便快捷，可以随时向网上老师或网友提问，可以及时得到最新的学习指南；缺点是需要个人有较高的自控能力，严格执行自己的学习计划，不得随意变更，不得强调客观原因，否则容易白白浪费时间。影响学业完成是什么意思？

Advantage online learning is convenient, can teacher or to the Internet users to ask questions at any time, you can keep informed of the latest study guide; shortcoming is the need to have high self-control, strict implementation of their own learning plans shall not be changed arbitrarily, not stressed that objective reasons, otherwise easy to waste time. Impact studies completed