bié / yǐ / wéi / duì / shǒu / hěn / ruò / xiǎo / xīn / zài / bǐ / sài / zhōng / yīn / gōu / lǐ / fān / chuán

别以为对手很弱，小心在比赛中阴沟里翻船。

Don't assume your opponent is weak, or you may suffer an unexpected defeat in the competition.