“exploratory work”可以造什么句，exploratory work造句

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.

What drawbacks exist now in the geological exploratory work system?

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.