Osteogen
成骨质
🗣️ 情景例句
Still waters run deep.
冰冻三尺非一日之寒。
For once, I haven't taken the wrong train!
我从来不曾误搭过一次列车。
Look! That girl has fallen off her bicycle.
看！那个女孩从自行车上摔下来了。