Optional or suggested readings may also be identified for various topics to allow further study for those interested in more depth.
另外也可能会为了不同的主题，指定选择性或建议的阅读资料，以便对于有兴趣的主题，作更深入的研究。
Optional or suggested readings may also be identified for various topics to allow further study for those interested in more depth.
另外也可能会为了不同的主题，指定选择性或建议的阅读资料，以便对于有兴趣的主题，作更深入的研究。
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