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硬い， 固い， 堅い， 緊い， かたい
1. hard, solid, tough
2. stiff, tight, wooden, unpolished (e.g. writing)
3. strong, firm (not viscous or easily moved)
4. safe, steady, honest, steadfast
5. obstinate, stubborn
6. bookish, formal, stuffy
tbd
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茹でる， 煠でる， ゆでる， うでる
1. to boil (something in hot water)
2. to treat with medicinal steam (a swelling, etc.)
在沸水中煮(东西)；用药蒸汽治疗(肿胀等病症)
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
