zài / fǎ / lǜ / wèn / tí / shàng / kǒu / shuō / wú / píng / zuì / hǎo / bǎo / liú / zhèng / jù

在法律问题上，口说无凭，最好保留证据。

In legal matters, verbal claims are not proof, so it is best to keep evidence.