英语语法分析

This notice says that all the introductory marketing classes are closed.

这一通知说，所有的市场营销入门课程都结束了。

An introductory sentence for a brief summary of the passage is provided below.

下面这个介绍性句子简要总结了这篇文章。

Introductory exercises and in-game aides like "peekaboo", which compares top-scoring solutions with yours, help novices get up to speed.

介绍性练习和游戏中的助手，例如“peekaboo”，可将得分最高的解决方案与您的解决方案进行比较，帮助新手快速入门。