• 1. the sign function: 面的符号函数

• 1.On the basis of analyzing the control step for ice conversing to hydrate and introducing the sign function, the unreacted core shrinking model for hydrate formation was proposed.
  在对冰转化为水合物控制步骤分析的基础上，引入符号函数并提出一个改进的未反应核收缩模型来描述冰转化为水合物的动力学。
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• 2.TAM performs the authentication function with the user and either accepts or rejects his sign-on.
  TAM对用户执行身份验证功能，将接受或拒绝登录。
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• 3.Mr Guyton has preserved space for those ghosts of function: above the doorway a sign boasts, “WE DO DROP OFF BUNDLES”.
  盖顿先生还预留了画鬼魂的空间：在门上方刷着一个标志宣称，“我们真正抛弃了束缚”。
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