Osteogenin
成骨素
🗣️ 情景例句
International travel involves a lot of waiting around in airports.
经常在机场等候是环球旅行的一部分。
The brave man hazards his life, but not his conscience.
英雄的人可以冒生命危险，但不冒良心危险。
I'm sure you'll be pleased with this product.
我敢保证你会喜欢这种产品的。