You can set an event handler for the first time the user enters data into the main content field. Figure 2 illustrates.
可以设置用户首次向主要的内容字段输入数据时的事件处理程序，如图2所示。
In the field of communication security, the main applications of the hash function are data integrity verification and signature authentication.
哈希算法在信息安全领域主要应用于验证数据完整性和签名认证。
In this paper, the main factors affecting tunnel erosion and their mechanism were studied based on field survey and data from sample analysis.
本文以野外调查和资料分析为基础，分析研究了影响洞穴侵蚀的主要因素和机理。
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