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By simulating the switch unit, it can be seen that ATM switch unit that is designed by use of hierarchical design of top down with VHDL can perform the basic function of cell head changing, routing and queuing. If many cells race one output channel, the ATM switch can put these cells into a buffer, then queue and output them. When the broadcast cell advents, it can be delivered to all channels.

本文通过对所设计的基于VHDL描述的ATM交换单元进行仿真验证可以得出如下结论：采用自顶向下的层次化设计、由VHDL描述的ATM交换单元能够实现信头变换、选路和排队三项基本功能；当多个信元同时竞争某一出端时能够对信元进行缓冲存储和排队输出；而且当有广播信元到来时还可以对所有出端进行广播输出。

1It was discovered just after Darwin release his theory of evolution. It appear so soon that people doubt advents forged this fossil in order to evident Darwin's theory. 2the feather on the limestone of the fossil is so clear and perfectly formed that people doubt it is a artificial one. 3there is a split on the fossil, and the two pieces did not join together tightly.

由 1980s，某知名历史学家提出，原因有三： 1他怀疑这个化石是达尔文伪造的，目的在支持他的&鸟类从爬行动物进化而来&的理论； 2化石的纹理过於清晰，经过千百年历史，鸟的羽毛依然可见，这很不正常； 3化石有两部分组成，然而这两部分不能完整的拼合在一起，可见这是假造。

For the orbit estimation algorithm based on the measurement of the geomagnetic field vector,when measurement data influenced by outliers,filtering advents deviation,convergence becomes slow and even diffuses.

近地轨道由于有丰富的地磁场资源，且具有相当好的地磁场模型，可以采用高斯球谐函数来描述地磁场模型，这样磁场的强度和方向是位置的函数，因此能采用磁测的方法对卫星进行定轨导航[1，2]。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。