理解像解析器和PDOM这样的功能则花费了更长的时间。
It took longer to understand features like the parser and the PDOM.
理解像DI这样的主题时，困难之一就是这个主题与其他无关主题的耦合数量。
One of the difficulties in understanding a topic like di is the amount of coupling this topic has with other, unrelated topics.
生和死是生理上的概念，了解它们要以了解像呼吸、血循环和消化等生理过程为前提。
These are biological concepts which presuppose an understanding of internal biological processes like respiration, blood flow and digestion.
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