Zhèngkè men yǒushíhou yánbù-yóuzhōng, shuō de hé xiǎng de bùyīyàng.
Politicians sometimes say things they don't mean - what they say differs from what they think.
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Literally: 言 (words) 不 (not) 由 (from) 衷 (heart/innermost). Words that don't come from the heart - insincere speech. The key character is 衷, meaning the innermost feelings.
