1. The instructor writes an important term on the chalkboard, and you dutifully copy it in your notebook. 当老师在黑板上写下一个重要的术语时，你应该认真地把它抄在笔记本上。
2. Subsequent experiments reproduced this effect with other stimuli, such as the sound of fingernails on a chalkboard and photographs of disgusting insects. 随后的实验利用其它刺激物再现了该结果，如指甲刮擦黑板的声音和恶心的昆虫图片。
3. Nails on a chalkboard. 黑板上有钉子。
4. Wipe the chalkboard with a damp cloth. 拿一块湿布来擦粉板。
5. Now we need to a background for the chalkboard. 现在我们需要一个背景黑板。
