请在文件上盖章。
qǐngzài wénjiàn shàng gàizhāng 。
Please affix the seal on the document.
他需要在报告上盖章才能提交。
tā xūyào zài bàogào shàng gàizhāng cáinéng tíjiāo 。
He needs to affix a seal on the report before submitting it.
我们必须在协议上盖章以示认可。
wǒmen bìxū zài xiéyì shàng gàizhāng yǐshì rènkě 。
We must affix a seal on the agreement to show approval.