Cistine
氨基酸
??? 情景例句
What was the weather like yesterday?
昨天的天氣怎么樣？
Competition for this kind of goods is tough.
這種商品的競爭非常激烈。
When they were very young, Mr. Green sometimes dressed up in a red coat. But he doesn't do that now.
在他們很小時，有時候格林先生穿上一件紅色的外套。但他現在不那么做了。