Things that might have been optional in the past for job seekers are now mandatory.

VOA: standard.2010.07.28

Right. Related to that: attendance here is obviously not mandatory.

对了，关于那个事儿：,出勤明显不是强制要求的。

麻省理工公开课 - 计算机科学及编程导论课程节选

Sections are also mandatory.

所有课程中的章节都是必修的

耶鲁公开课 - 聆听音乐课程节选

"President Obama has made it a clear commitment to revolutionize the way that we use energy, including mandatory cap and trade legislation, long-term submissions reductions goals and a commitment to renewable energy technologies,"

VOA: standard.2009.08.31

Sections are mandatory.

分组作业是强制的。

哈佛公开课 - 幸福课课程节选