What is "construction"?
    Hava u ever  used construction paper to make some things?
What is " software construction"?

• problem definition
• requirements development
• construction planning
• software architecture or higt-level design
• detailed design 
• coding and debugging
• unit testing
• integration testing
• integration
• system testing
• corrective maintenance

Then, construction is not a coding but a programming.
 There are also many other important activities.

• management  
• user-windows design 
• maintenance  

so , "Why is software construction importment?"

• 构建活动是软件开发的主要组成部分。 /constrution activity is an important part of software programming.
• 构建活动是软件开发中的核心活动。/constrution actiity is  the central activity of software programming. 
• 把主要精力集中于构建活动，可以打打提高程序员的生产率。/puting the most power in constrution actiity can improve the rate of 
•                                                                                                programming for programmers.  
• 构建活动的产物--源代码--往往是对软件的唯一的精确描述。/source code,the result of constrution activity ,is the only description  
• <Key point>构建活动是唯一一项确保完成的工作。/ constrution activity is the only to make  the work done. 

another key point ：  构建活动的质量对软件的质量有着实质性的影响。    /the quality of software is under the quality of constrution acti-vity.  
Some happiness：
    常年20度的房间里，你可以发现病毒（virus），特洛伊木马（Trojanhorse）,蠕虫（worm），臭虫（bug），逻辑炸弹（bomb），奔溃（crash），论坛口水战（flame），双绞线转换头（twisted sex changer），还有致命错误（fatal error）....(我看到这里笑了..haha)