重点讲解：
1. a series of 一连串；一系列；连续；接连；
A series of technical foul-ups delayed the launch of the new product.
一系列技术问题延误了新产品的上市7F(H!V*X|gxiO0E4C~。
2. a variety of 各式各样；多种多样；
West Hampstead has a variety of good shops and supermarkets.
西汉普斯特德有各种各样不错的店铺和超级市场UqqcXvOJ[x。
3. tip off 给…通风报信；暗中告知；
Greg tipped police off on his car phone about a suspect drunk driver.
格雷格用他的汽车电话向警方报告了一个有酒后驾驶嫌疑的司机SDiH11i(Xf6bxUk_X。
4. break down （使）（物质）分解；
The oil is attacked by naturally occurring microbes which break it down.
原油受到了自然产生的分解油类物质的微生物的侵蚀TZw.6JXAdmrL.16hH。