cotton boll的用法和樣例：
例句
- Some cotton bolls have fallen on the ground.
有些棉桃落在地上了。 - The cotton bolls burst open, revealing masses of snow-white fibres.
棉桃綻裂，露出雪白的棉花。 - Boll rot has been attributed to a wide range of organisms.
棉鈴腐爛是由分布范圍廣泛的微生物引起的。 - The cotton grows on the plant as long hairs attached to the seeds inside the boll.
棉花在植株上作為附著(zhù)在種籽上的長(cháng)茸毛在棉鈴里生長(cháng)發(fā)育。
