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限る， かぎる
1. to restrict, to limit, to confine
2. to be restricted to, to be limited to, to be confined to
3. to be best (for), to be the best plan, to be the only way (to)
限制，约束；仅限于，局限于，限定于；最适合(某事)，最佳方案，唯一途径(实现某事)
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
が
1. indicates the subject of a sentence
2. indicates possession
3. but, however, (and) yet, though, although, while
4. and
5. used after an introductory remark or explanation
6. regardless of ..., whether ... (or not), no matter ...
7. indicates a des...
tbd
