每章都提供了Portlet代码，这样，如果有疑难问题，可以参考该主题区域的解决方案。
Portlet code is provided for each chapter so that, if you do get stuck, you can refer to the solution for that topic area.
这一理论也为解决宇宙奇点疑难，宇宙的起源提供了一种可行的方案。
This theory also provide a possible schema for solving the singularity problem and the birth of the universe.
施工方案的推介及施工疑难的解决。
The promotion of construction program and the resolve of construction difficulties.
应用推荐