Now, the two most common types of osteoporosis are postmenopausal osteoporosis and senile osteoporosis.

如今，最常见的两种骨质疏松是绝经后骨质疏松与老年性骨质疏松。

There are two common types of osteoporosis: these are senile osteoporosis and postmenopausal osteoporosis.

常见的骨质疏松有两种：老年性骨质疏松与绝经后骨质疏松。

With senile osteoporosis, on the other hand, it's believed that osteoblasts just gradually lose the ability to form bone, while the osteoclasts keep doing their thing unabated.

另一方面，老年性骨质疏松被认为是由于造骨细胞逐渐失去造骨的能力，同时破骨细胞持续工作，活力不减。