Zài yìhuì li, fǎnduìdǎng zhàn le sān fēn zhī yī de xíwèi.
In parliament, the opposition holds a third of the seats.
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Strictly a multi-party-system term. In news about the UK, Japan, Taiwan, etc., 反对党 means the formally organized 'opposition party'. It is not used to describe internal factions inside the Chinese Communist Party.