When building an in-memory tree is not desired or practical, use an iterative parsing technique that does not rely on reading the entire source file. LXML offers two approaches.
如果构建内存树并不是必须的或并不实际，则可以使用一种迭代解析技术，这种技术不需要读取整个源树。
Advanced Mandarin Chinese, both reading and writing, is strongly desired. English does not need to be fluent-but you must be able to communicate in English.
需要中文阅读和书写流畅。英文不需要流利，但必须能够用英文交流。
Performance: its specific application to the secondary process of teaching reading novels, often fails to produce the desired results.
表现为：将其具体应用到中学小说阅读教学过程中，往往收不到预期的效果。
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