基于进入系统的时间，写操作具有幂等性(不管操作多少次结果都不变的性质，比如取绝对值的函数就具有幂等性)和交换性(操作顺序不影响结果，比如加法就具有交换性)。
Write operations are idempotent and commutative, based on the time they enter the system.
本文应用线性波理论，通过波浪叠加法，探讨了海洋平台油气生产立管系统的动力性质。
In this paper, linear wave theory and wave superposition method are used to study dynamic behavior of oil or gas production risers on the offshore platform.
给出线性流形的定义及性质，并对线性流形的全体定义了加法与数乘运算，得到了线性流形空间。
The definition and feature of linear manifold are given. The operation of adding and multiplying is defined for entire linear manifold, hence, linear manifold space is obtained.
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