Having their origins in China, chopsticks are used in many Asian countries.
筷子起源于中国,现在很多的亚洲国家都使用它。
He is playing on the see-saw in the yard.
他正在院子里玩跷跷板。
I was doing some exercises on the high-and-low bars. When I landed, I fell forward and hurt myself. Someone was standing too close and I knocked into him and fell over onto my shoulder.