【词汇讲解】
1.tummy n. 肚子，胃
如：Bud, stop carrying on about your tummy ache like that.
巴德，别为肚子痛大呼小叫了。
2.amino acid n. 氨基酸
如：A peptide containing many molecules of amino acids, typically between10 and100.
多肽一种含有许多氨基酸分子的肽，典型地是在10和100之间
3.restful adj. 益于休息的，平静的，安静的
如：Pastel colours are restful to the eye.
清淡柔和的颜色可以养目。
A room painted in restful colors.
房间漆有宁静的颜色
4.digestive adj. 消化的，有助消化的
如：A hollow digestive organ, especially the stomach of certain insects or the gizzard of a bird.
消化器官，胃，中肠，砂囊一种中空的消化器官，尤指某些昆虫的胃或者鸟的砂囊
Over the periods their saliva, a mild, digestive juice like our own, was converted into a poison that defies analysis even today.
经过若干演化阶段，蛇的唾液，一种温和的助消化的象人们的唾液一样的液体变成了甚至在今天也难以分析的毒液。