3. Solving these equations is involved and we simply sketch the results. 解这些方程式是复杂的，我们简单地梗概其结果。
1. preliminary drawing for later elaboration
2. a brief literary description
3. short descriptive summary (of events)
4. a humorous or satirical drawing published in a newspaper or magazine v.
1. make a sketch of
2. describe roughly or briefly or give the main points or summary of