qiān dìng hé tong shí, jiǎ fāng xū yào àn zhào yuē dìng àn shí jiāo fù xiàng mù chéng guǒ.

签订合同时，甲方需要按照约定按时交付项目成果。

When signing a contract, Party A needs to deliver the project results on time as agreed.