A new Czechoslovak film has had its premiere at the Karlovy Vary film festival.一部捷克斯洛伐克新电影在卡罗维发利电影节上首映。A new Czech film has had its premiere at the Karlovy Vary film festival.一部捷克新电影在卡罗维发利电影节上首次上映。Vary your presentation, using handouts and overheads as appropriate.适当地使用讲义和投影，让你的陈述多些花样。