The history class was conducted in a double period, allowing for a more in-depth discussion.
历史课是双课时进行的，这使得深入的讨论成为可能。
Students often prefer double periods for lab work to ensure they have enough time to complete experiments.
学生通常更喜欢双课时进行实验课，以确保他们有足够的时间完成实验。