（     ）年约瑟夫·尼普斯拍摄了一幅牵马的孩子的影像，这是世界上（     ）有确切年代可稽的照片。1826年，他再次成功的拍摄了其工作室窗外的风景，这是世界上第一幅永久性照片。

问答题What is the simplest type of motion a fluid particle can undergo?

问答题Fill in the blank with one word. The first letter is given already. 在横线上填上合适的单子，单词首字母已给出。注意所填单词前后两个句子之间的联系。(答案请给出完整单词，注意拼写和大小写) Overseas study has certainly brought about many benefits for young people. To begin with, studying abroad gives students a better chance to develop their foreign language skills. F______, studying abroad can widen young people’s vision since they are exposed to a new culture and new people. As a result, they would learn to view the world from a global perspective, In addition, studying abroad encourages independence. Students need to face life challenges by themselves. During the process, their maturity, confidence as well as elf-reliance gradually build up.