Bring the subject into focus if you want to have a good picture. 要想拍出好的照片，必须给被摄物对好焦距。
Remember to focus the camera before taking the photo. 记住在拍摄以前对好焦距。
In the beginning I did not understand the professor's lecture,but when I read the papers he assigned for us to read at home everything fell into place. 刚开始我听不懂那位教授讲的课，但当我读完他布置我们在家阅读的材料后，一切都变得清楚起来。
