设计者有时也需要清楚地了解媒介在技术上的约束和限制，以及在开发部门有限的时间和预算的情况下到底可实现哪些内容。
Designers also need a clear understanding of the technical limitations of the medium and what can reasonably be accomplished on time and budget by the development organization.
这种环境充满活力，设计师、开发人员和管理者面临着要跟上受众不断变换需求的挑战，而且通常资源有限，还要承受时间压力。
In this dynamic environment, designers, developers and managers are challenged to keep up with the shifting needs of their audience, usually with limited resources and under time pressure.
对于用户自绘制功能的实现，更是需要花费大量时间和人力开发绘图控件，而且功能极为有限。
And the realization of user-mapping function also takes a lot of time and manpower to develop a drawing control, and the functions of it are extremely limited.
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