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剣， 劒， 劍， けん， つるぎ
1. sword (esp. a large, double-edged one), blade
2. bayonet
3. swordsmanship
4. stinger, ovipositor, dart
剑（尤指大型双刃剑），刀刃；刺刀；剑术；螫针，产卵管，飞镖
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真剣， しんけん
1. serious, earnest
2. real sword (as opposed to a wooden practice weapon)
严肃的，认真的；真剑(相对于木制练习武器而言)