Meaning of dǐ xiàn:
底线
bottom line; the limit of what one is prepared to accept; (sports) baseline; (sewing) under thread; spy; informer; plant
Wǒ bùnéng jiēshòu chāoguò zhège dǐxiàn de tíyì.
我不能接受超过这个底线的提议。
I cannot accept a proposal that goes beyond this bottom line.
Wǎngqiú guīzé yāoqiú qiúyuán zài fāqiú shí bùnéng cǎiguò dǐxiàn.
网球规则要求球员在发球时不能踩过底线。
Tennis rules require players not to step over the baseline when serving.
Féngrènjī de dǐxiàn juédìngle fénghé de láogù chéngdù.
缝纫机的底线决定了缝合的牢固程度。
The under thread of the sewing machine determines the strength of the stitching.
Tā de rènwù shì zuòwéi gōngsī nèi de yīgè dǐxiàn.
他的任务是作为公司内的一个底线。
His task is to act as a spy within the company.