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病弱， びょうじゃく
1. weak (constitution), sickly, feeble, in poor health
tbd
弟， おとうと， てい
1. younger brother, little brother, kid brother
2. brother-in-law (spouse's younger brother or younger sister's husband)
3. pupil, apprentice
弟弟，小弟，小兄弟；姐夫/妹夫（配偶的弟弟或妹妹的丈夫）；学生，学徒
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
ずっと， ずーっと
1. continuously, the whole time, all the way, throughout
2. much (more), (by) far, far and away, a lot, a great deal
3. far (away), long (ago, before, after)
4. straight, directly
一直，不停地；多得多，远远超过，远远超过，很多，相当多
