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まだ, いまだ, 未だ
1. still, as yet, only
2. (not) yet
3. more, (more) still
4. at least, comparatively, relatively
5. unfinished, incomplete, not yet done
至今,迄今为止,仅有;还(没有)、尚未;更多,(更多)依然;至少,相对而言,相比之下;未完成的,不完整的,尚未完成的
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