v.开放，自由进出
Spring Break: Read the parts of Chap. 6 that complement the OPE material discussed in class.
8春假: 阅读第六章的一些部分以补充课上关于算符乘积展开内容的讨论.
Data co ection already ope tra fer starting.
数据连接已经打开,开始传送数据.
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