茶碱是咖啡因的近亲，也是茶中的主要兴奋剂，它在这两方面都是最有效的化合物之一。
Theophylline, a close structural relative of caffeine and the major stimulant in tea, was one of the most effective compounds in both regards.
我们的研究发现主要存在着认识不到位、资源开发的管理不够完善两方面的问题。
Our study figures out two main obstacles, which are impercipience and imperfection of resource management.
问题的症结在于劳动力市场，主要有两方面原因。
The blockage lies in the labour market, for two main reasons.
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