1.They have their smiles and tears.

他们也有自己的欢乐和悲哀。

2.Every life has its roses and thorns.

每个人的生活都有甜有苦。

3.During the war,he was an embryo surgeon,and joined the mobile medical team.

在战争中，他是一个初出茅庐的外科医生，参加了巡回医疗队。

4.Application of laser in medicine is still in its infancy.

激光在医学中的应用仍处于发展的初期。

5.I was not one to let my heart rule my head.

我不是那种让感情统治理智的人。

6.His success in this field has pushed his forerunners' point into the background.

他在这方面的成就使其前辈的论点黯然失色。

7.American students come to China to learn many things.

美国学生在中国学习，有广阔的天地。