把函数$f\left(x\right)=\sin 2x$的图像向左平移$\frac{\mathrm{\pi }}{4}$个单位，所得图像的解析式是（     ）

    Most people have jobs. They go to 1 nearly every day. Some people are lucky. Either they have very interesting jobs or they earn a lot of 2. Most people are not so lucky. Either their jobs are a bit 3 or they don't get well 4.

    The most interesting jobs are often the most 5. People spend long time learning how to do them. Doctors study for 6 six years after finishing school. Airline pilots(飞行员) study longer. They have to learn to fly small airy craft first, and then 7 move up to bigger and bigger aircraft. Most airline pilots are at least 30 years old.

    Some 8 people have interesting and well-paid jobs. Many successful athletes(运动员) are usually under 35. Older people usually can't 9 these sports very well because they can't move fast enough.

    Most people work until they are 60 or 65 year old. Some people 10 retire. These people usually have very interesting jobs. Writers, artists, musicians and actors usually work until they die.