主构造函数，类的主题，有一个参数列表来接受标签字符串和回调函数的列表。
The primary constructor, which is the body of the entire class, has a parameter list that takes a label string and a list of callback functions.
例如，若使用传统复制(非主复制)，有可能定义一个这样的复制：在源节点上有一个int8列，而在其他节点上有一个整数列。
For example, using classic (non-master) replicates, it is possible to define a replicate with having an int8 column on the source node and an integer column on other nodes.
Traits不支持辅助构造函数，它们也不支持在主构造函数，trait的主体里的参数列表。
Traits don't support auxiliary constructors, nor do they accept an argument list for the primary constructor, the body of a trait.
读和写操作是通过两条公共的数据总线进行的：其中一条联结32个奇数列，另一条联结32个偶数列，用一个公用的主放大器把数据输出。
Read and write-operations are carried out by two common data buses: one is connected with the 32 odd rows, the other is for the 32 even rows. The data output is executed by a common main amplifier.
读和写操作是通过两条公共的数据总线进行的：其中一条联结32个奇数列，另一条联结32个偶数列，用一个公用的主放大器把数据输出。
Read and write-operations are carried out by two common data buses: one is connected with the 32 odd rows, the other is for the 32 even rows. The data output is executed by a common main amplifier.
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