Cistine
氨基酸
🗣️ 情景例句
My parents are expecting to see good grades this semester.
我父母希望我这个学期取得好成绩。
By the side of sickness health becomes sweet.
和疾病相比较，才显得健康的可贵。
You're perfectly welcome to inspect the winning bid.
我们很欢迎你来查阅得标者。