tā / yì / shí / tóu / nǎo / fā / rè / jìng / rán / dā / yìng / le / zhè / ge / bù / hé / lǐ / de / yāo / qiú

他一时头脑发热，竟然答应了这个不合理的要求。

Acting on a sudden impulse, he actually agreed to this unreasonable request.