balsa的复数形式怎么写？

balsa的音标：balsa的英式发音音标为：['bɔ:lsə]balsa的美式发音音标为：['bɔlsə]...

n.轻木（用于制造模型）...

The children were asked to model an airplane out of balsa - wood.孩子们被要求用轻木做模型飞机.Agriculture: bananas, coffee , cacao, rice; cattle; balsa wood; fish.农业: 香蕉, 咖啡,可可, 大米; 牛肉; 木材, 鱼类.The duo cut rectangular holes in balsa wo...