1. Cinchonas are trees native to South America that produce quinine, a key ingredient in tonic water.
Translate: 金鸡纳树是原产于南美洲的树木，产生奎宁，是奎宁水的关键成分。

2. The cinchonas in our garden are thriving, thanks to the warm climate and ample sunlight.
Translate: 我们花园里的金鸡纳树茁壮成长，多亏了温暖的气候和充足的阳光。

3. Many pharmaceutical companies extract quinine from cinchonas for use in medications to treat malaria.
Translate: 许多制药公司从金鸡纳树中提取奎宁，用于治疗疟疾。

4. The bark of cinchonas is known for its bitter taste and medicinal properties.
Translate: 金鸡纳树的树皮以其苦涩的味道和药用特性而闻名。

5. Cinchonas have been used for centuries in traditional medicine to treat fevers and other ailments.
Translate: 金鸡纳树几个世纪以来一直被用于传统医学中治疗发烧和其他疾病。

6. The demand for cinchonas has increased as more people recognize the health benefits of quinine.
Translate: 随着越来越多的人认识到奎宁的健康益处，对金鸡纳树的需求也在增加。