1. abiding by 遵守
Abiding by the principle of the definition of conversation meaning is of benefit to improve listening comprehension.
遵循会话含义的基本概念、原则，有助于听力理解的提高NXwBd4;CA4Fk,#YE@。

2. walk away from 退出
Analysts said the rally was a result of Google's statement that it might walk away from China's search engine market.
分析人士称，谷歌考虑退出中国搜索引擎市场的消息刺激了百度股价上涨7@UW]FG,9uv~7,EDARHx。

3. in the run-up to 在……前夕
That suspicion tends to be strongest in the run-up to new year, when the nation shuts down for a week's vacation.
这种疑心往往在春节之前，全国各地都会放假一周时最为强烈;BQhzz=-i=2。

4. give sb. an edge 给某人带来优势；让某人抢占到先机
Thorough preparation may give yourself an edge over your competitors.
全面的准备工作或许能让你在竞争者面前抢占到先机PX_bj]jNm1。