periodontal lignment的用法和樣例：
例句
- Effects of continuous and intermittent forces on the function of secreting osteoblast-like markers by human periodontal ligament cells in vitro.
比較間歇性和持續性牽張力對人牙周膜細胞成骨樣細胞分泌活性的影響。 - After growing them, they found their structures had matured into the components that make teeth, including dentin, enamel, dental pulp, blood vessels, and periodontal ligaments.
經一段時間的生長，他們發現在結構上它們已形成包括牙本質，牙釉質，牙髓，血管，牙周膜的牙組織的各個組分。
