Tā liànle sān nián shuāngjiégùn, yǐjīng shuǎ de hěn shúliàn le.
He's been practicing nunchaku for three years and can already wield them very skillfully.
Tips
memory
Literally 'double-section stick' — 双 (double) + 节 (section/joint) + 棍 (stick). Two sticks joined by a 'joint' (the chain). Visualize the name and you've described the weapon.
Iconic 2001 Jay Chou (周杰伦) hit; the song's hard-rock intro and the line 哼哼哈兮 (hēng hēng hā xī) became an instantly recognizable cultural touchstone for a whole generation. (Note: the song title uses the 截 variant spelling.)