tā / ài / kǒu / shí / xiū / bù / hǎo / yì / si / dāng / miàn / jù / jué / péng / you / de / qǐng / qiú

他碍口识羞，不好意思当面拒绝朋友的请求。

He was too embarrassed to speak and felt unable to refuse his friend's request directly.