用exploratory work造句子，“exploratory work”造句

Project workers this week began exploratory works in the riverbed outside the Palace of Westminster, where a borehole was sunk to analyse the ground conditions facing engineers digging the tunnel.

What drawbacks exist now in the geological exploratory work system?

Utilization and fixation of the distant heterosis in rice by one line method has been an exploratory work in rice breeding with great enticement and difficulty.