は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题;表示与另一选项(无论是否明确提及)形成对比;表示强调
かしら, かしらん
1. I wonder, do you think?, I might, how about
2. some kind, some stage, somehow, somewhere
tbd