利用半代数的同余来讨论半代数的同态定理及其第一，第二同构定理。

Then, with congruence of the semialgebra, we proved the homomorphic theorem of semialgebra and its first and second isomorphic theorems.

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现在缅因州仅存70艘底层鱼捕鱼船，仅及上世纪90年代数字的一半，与几十年前比起来，相较甚远。

There are only 70 groundfishing vessels left in Maine, less than half the number in the 1990s, and a far cry from decades past. Few working waterfronts remain.

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半群的研究在代数学的理论研究中占有很重要的地位。 其中格林关系在半群理论的研究中有着重要的意义。

The research of semigroup plays an important role in the research of the theory of algebra, and the Green's equivalences are especially significant in the study of semigroups.

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