mammillae

During the biology class, the teacher pointed to a diagram and explained the structure of a mammilla.

生物课上，老师指着图解说明了乳头的结构。

用法提示：此处 mammilla 为名词单数，在句中作宾语，表示‘乳头’。

In many farm animals, the number of mammillae is related to how many babies they usually have.

在许多家畜中，乳头的数量通常与它们产仔的数量有关。

用法提示：mammillae 是 mammilla 的复数形式，在句中作主语，指‘乳头’。

While breastfeeding, the mother felt a small lump near the mammilla and mentioned it to her doctor.

哺乳期间，这位母亲感到乳头附近有一个小硬块，并告诉了医生。

用法提示：句中 mammilla 为名词单数，表示‘乳头’，作介词 near 的宾语。