Kèhù yǒu yìxiàng le, wǒmen yào chènrè-dǎtiě, jǐnkuài qiān hétong.
The client is interested - we need to strike while the iron is hot and sign the contract quickly.
Tips
memory
趁 (to take advantage of) + 热 (hot) + 打 (to strike/beat) + 铁 (iron). A blacksmith must hammer iron while it's still red-hot - once it cools, it becomes rigid and unworkable. This directly matches the English idiom 'strike while the iron is hot.'