Solid laser is a four-level system.
固体激光器是一个四能级系统。
This is a four-level English program.
这是一个分为四级的英语课程。
At a high level, an ESB has four major functions.
概括地讲，ESB具有四个主要功能。
The entry level point for that car will be a 1.8 liter four-cylinder turbo.
那部车的入门级点将是一个1.8升四缸涡轮增压。
This level is divided into four bedrooms, two bathrooms and a home office.
这一层被分为四间卧室、两间浴室和一个家庭工作室。
In that year, four English and we should work towards a Level II exam in the computer.
在这一年，我们应该为英语四级和计算机二级考试而努力了。
In that year, four English and we should work towards a Level II exam in the computer.
在这一年，我们应该为英语四级和计算机二级考试而努力了。
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