uncommon

1. ADJ If you describe something as uncommon, you mean that it does not happen often or is not often seen. 不常發(fā)生的; 不常見(jiàn)的

Fortunately, cancer of the breast in young women is uncommon. 幸運(yùn)的是，年輕婦女患乳腺癌的情況不常見(jiàn)。