Osteogenin
成骨素
🗣️ 情景例句
my grandfather is
我爷爷
From today, let us begin to work together.
从今天开始让我们一起工作吧。
There is no sky in June so blue that it does not point forward to a bluer,
六月蔚蓝的天空总使人遥想一个更加蔚蓝的苍穹；