不常见的用英语怎么说？

不常见的

例句

• Less common reagents that attack polymers include acids, bases. 比较不常见的浸蚀多聚物的化学浸蚀物有酸 、 碱.
• Inflammatory fibroid polyp, an uncommon lesion of the gastrointestinal tract, most commonly occurs in the stomach. 摘要炎性纤维息肉是一种不常见的胃肠道病变, 胃是病变最常出现的器官.
• Dr Abou - Alfa: As you mentioned, intrahepatic cholangiocarcinoma ( IHC ) remains an uncommon disease. Alfa博士: 就象你提到的, IHC 还是一种不常见的疾病.
• It was one of his rare attempts at humour. 那是他极不常见的想要表现幽默的一次。