1. “你没有来月经”的英文表达艺术化诠释：

You've missed the monthly dance of Auntie Flow

Your menstrual cycle has gone missing in action

Your monthly visitor has skipped a beat

Hasn't your period arrived as expected? (书面或正式场合)

You're experiencing a temporary pause in the monthly cycle (医学专业术语风格)

这些表达方式既保持了的意思，又融入了更生动、形象的描述，使得表达更加丰富多彩。

2. “你没有来学校”的英文表达多样化诠释：

You've skipped today's class at school (日常口语表达)

School attendance is missing from your daily routine today (更正式的说法)

Your absence at school today is notable (疑问句式)

Did something happen that prevented you from coming to school today? (疑问句式，带有关切之意)

补充说明：在描述月经时，“period”确实是口语中最常用的词汇；而在谈论学校相关事宜时，“come to school”是基础短语，表示否定时使用“didn't”是标准的过去式表达。