Lactamine
丙氨酸
🗣️ 情景例句
A lot of people would like my help.
许多人要我帮助。
How do you spend your leisure time?
你怎样打发业余时间？
both men were genuinely sorry that they had to leave.
这二位不得不离开那个荒岛时，还真的感到遗憾呢！