Pentasaccharides
五糖
🗣️ 情景例句
He has a major toy buyer in Los Angeles,
他在Los Angeles有一个玩具大买主，
Not only did he make a promise, but he also kept it.
他不仅许下诺言，而且遵守了。
The train was late but nobody knew the reason for the delay.
火车晚点了，但没人知道为什么。