管理扩展的依赖关系和更新既不简单，也不易懂。
Managing the extensions dependencies and updates is not easy or straightforward.
你应该将主要精力用于听容易懂的、而不是太难的材料，听力材料太难，不易理解，学起来就慢。
Most students listen to English that is much too difficult. They don't understand enough, and so they learn slowly.
你应该将主要精力用于听容易懂的、而不是太难的材料，听力材料太难，不易理解，学起来就慢。
Most students listen to English that is much too difficult. They don't understand enough, and so they learn slowly.
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