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軽い， かるい， かろい
1. light (i.e. not heavy), feeling light (i.e. offering little resistance, moving easily)
2. light (i.e. of foot), effortless, nimble, agile
3. non-serious, minor, unimportant, trivial
4. slight, small, gentle, soft, easy, lighthearted (e.g. joke)
5....
轻(不重)；不严重，不重要
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
