一个正在进行的项目——“追踪者”，在研究很长一段时期内的趋势或客户满意度。
Trackers, which are ongoing projects that look at trends or customer satisfaction over a long period of time.
皮尔斯先生以前的一个同事就是这个项目的支持者之一。
A former associate of Mr. Pierce's was among the project's boosters.
标有星号的项目是给高阶学习者的。
The star refers to items which are intended for the advanced learner.
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