仅供参考

wǒ men huì jì shang gōng chéng gū suàn jǐn gòng cān kǎo

我们会寄上工程估算，仅供参考。

We will send you an estimate for the work without obligation.

yī dé zhī yú jǐn gòng cān kǎo

一得之愚，仅供参考。

This is my humble opinion, for what it's worth.