| 1 | And while solar energy systems work moderately well in hot desert climates, they are still inefficient and contribute only a small percentage of the general energy demand. | |
| 2 | Duck your head down! | |
| 3 | She lowered her head under his gaze. | |
| 4 | 在这里，他们选择那些生活水平低下的当地人为实验对象，其中26%的人没有接受过正规教育，只有一半人有电视机，没有一个人有汽车，极少数人家里有电话。 There, they recruited local people whose standard of living was low: 26% had no formal education, only half owned TVs, none had a car and only a tiny minority had a telephone in the house. | |
| 5 | She had to duck her head to get through the low doorway. |
