二に大だい政せい党とう制せい

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Meanings

1

two-party system

A political system dominated by two major parties, as in the United States or United Kingdom.

The United States is a typical country with a two-party system.

二に大だい政せい党とう制せいでは、第だい三さん党とうが政せい権けんを取とるのは難むずかしい。

In a two-party system, it is difficult for a third party to take power.

多た党とう制せい
多党制 refers to a multi-party system where several parties can gain control, unlike the two-party dominance in 二大政党制.
一いっ党とう制せい
一党制 is a one-party system where only one party is allowed, contrasting with the competitive two-party structure of 二大政党制.

二に大だい政せい党とう制せい
Standard kanji spelling.
２に大だい政せい党とう制せい
Variant using numeral ２ instead of 二; less common but seen in some contexts.

Compound of 二大 (nidai, 'two great') + 政党 (seitō, 'political party') + 制 (sei, 'system').