Bo helping Chiung fix his bike today. Chiung's bike needs a new shifter and we bought one from Bo's friend. Now with the new shifter and new crang, Chiung can ride his bike faster!今天趁著BO有空, 哥哥把他的腳踏車帶過來修理. 他的車變速器一直壞掉, 我們跟BO的朋友買了一個二手的. 現在換好了變速器, 再加上新的齒輪盤, 哥哥騎車的速度就應該會快一點了!