1. The situation required that he be present. 这种情形需要他在场。
2. The situation required that he should be present. 这种情形需要他在场。
3. According to law, a doctor must be present at the ringside. 按法律规定,场边必须有一名医生。
4. The film-makers will be present at the screenings to introduce their works. 电影制作人将在放映时到场介绍他们的作品。
5. You could look for fireflies now and report your findings, but chances are slim that any will still be present at this time of year. 你现在可以寻找荧火虫,报告你的发现,但在每年的这个时候还能看到它们机会是非常小的。